Science question!!!
Why is all of geologic time before the Cambrian Period sometimes collectively lumped together called the "Precambrian"?
A-We have very few fossils from the time
B-Nothing lived during that time
C-The time period was very short
D-Everything from that time was destroyed by volcanos.
Answers
The answer is A-We have very few fossils from the time
Related Questions
Compare the reproduction in Hydra and Amoeba?
Answers
Answer:
Hydra:
Reproduction by budding in Hydra.
Amoeba:
Reproduction by binary fission in Amoeba.
Hydra:
Budding means sexual reproduction in which a new organism develops from a bud in the parent.
Amoeba:
Binary fission is the type of asexual reproduction in which the parent divides to give rise to two daughter organisms.
Hydra:
In budding process, bud is simply an outgrowth of cells at one particular site.
Amoeba:
The parent replicates its genetic material and divides it equally between the two daughters in binary fission.
Hydra:
The bud or the newly formed organism remains attached to its parent until maturation.
Amoeba:
Both the cytoplasm and the nucleus of the parent divides into two.
extrusive rocks have larger grains than intrusive rocks.true or false and why
Answers
False because extrusive rocks have fine-grained texture due to the rapid cooling of magna above the earth surface. On the other hand extrusive rocks have course grained texture due to slow cooling of magna beneath the Earth's surface
Which is not a part of the digestive system?
A. Large Intestine
B. Small Intestine
C. Trachea
D. Esophagus
Answers
Osmotic pressure is: the pressure required to stop the flow of solvent from a region of high solute concentration to a region of low solute concentration. the pressure required to stop the rupture of the semipermeable membrane. the pressure required to reverse the flow of solvent through a semipermeable membrane during osmosis. the pressure required to stop the flow of solvent from a region of low solute concentration through a semipermeable membrane into a region of high solute concentration. None of these
Answers
Answer:
the pressure required to stop the flow of solvent from a region of low solute concentration through a semipermeable membrane into a region of high solute concentration.
Explanation:
Osmosis is the movement of water (solvent molecule) from a region of low solute concentration to a region of high solute concentration via a semipermeable membrane.
Osmotic pressure is the pressure (force) applied to a given solvent in order to prevent it's movement via osmosis across a semipermeable membrane. Since, osmotic pressure is the pressure required to stop osmotic process, then it can be further defined as follows:
Osmotic pressure is the pressure required to stop the flow of solvent from a region of low solute concentration through a semipermeable membrane into a region of high solute concentration.
Explain the relationship between mutations, adaptations,
natural selection, and extinction.
Answers
Answer: A mutation results in different alleles for a gene and these different alleles will cause adaptations that may be favorable or unfavorable. If no species in an area has adaptations suited for the environment after it changes, extinction will occur.Adaptations result from random mutations in the genes of organisms. Depending on the environment, these adaptations may be favorable or unfavorable. If an adaptation is favorable, it is selected by nature and, over time, more and more organisms in a population will have it. If the environment changes so much that the adaptations of a species are no longer enough for the species to survive, extinction will occur.Mutations is very different because it results in different alleles for a gene.Adaptations is where an animals ADAPTS to an environment.Natural selection consists of overproduction,variation, favorable adaptations.extinction is when a species completely disintegrates.
Explanation:
Answer:
A mutation results in different alleles for a gene and these different alleles will cause adaptations that may be favorable or unfavorable. If no species in an area has adaptations suited for the environment after it changes, extinction will occur.Adaptations result from random mutations in the genes of organisms. Depending on the environment, these adaptations may be favorable or unfavorable. If an adaptation is favorable, it is selected by nature and, over time, more and more organisms in a population will have it. If the environment changes so much that the adaptations of a species are no longer enough for the species to survive, extinction will occur.Mutations is very different because it results in different alleles for a gene.Adaptations is where an animals ADAPTS to an environment.Natural selection consists of overproduction,variation, favorable adaptations.extinction is when a species completely disintegrates.
Explanation: got it on ed :)
Define the following terms: catabolism, anabolism, metabolism, glucose, glycolysis, glycogen, glycogenesis, glycogenolysis, gluconeogenesis, lipolysis, lipogenesis
Answers
Catabolism: The breakdown of complex molecules in living organisms to form simpler ones, together with the release of energy; destructive metabolism.
Anabolism: the synthesis of complex molecules in living organisms from simpler ones together with the storage of energy; constructive metabolism.
Metabolism: Metabolism is the process by which the body changes food and drink into energy. During this process, calories in food and drinks mix with oxygen to make the energy the body needs. Even at rest, a body needs energy for all it does.
Glucose: a simple sugar which is an important energy source in living organisms and is a component of many carbohydrates.
Glycolysis: Glycolysis is the first step in the breakdown of glucose to extract energy for cellular metabolism. Glycolysis consists of an energy-requiring phase followed by an energy-releasing phase.
Glycogen: Glycogen is the stored form of glucose that's made up of many connected glucose molecules.
Glycogenesis: The formation of glycogen from sugar.
Glycogenolysis: Glycogenolysis is the biochemical pathway in which glycogen breaks down into glucose-1-phosphate and glucose. The reaction takes place in the hepatocytes and the myocytes. The process is under the regulation of two key enzymes: phosphorylase kinase and glycogen phosphorylase.
Gluconeogenesis: Gluconeogenesis is a process that transforms non-carbohydrate substrates (such as lactate, amino acids, and glycerol) into glucose.
Lipolysis: the breakdown of fats and other lipids by hydrolysis to release fatty acids.
Lipogenesis: lipogenesis is the conversion of fatty acids and glycerol into fats, or a metabolic process through which acetyl-CoA is converted to.
Which of the following fresh water biomes consists of moving water
Answers
Answer:
Biomes consists of moving water is estuaries.
are plasmids plant,animal or bacteria cell?
Answers
Answer:
Bacteria
Explanation:
A plasmid is a small, often circular DNA molecule found in bacteria and other cells. Plasmids are separate from the bacterial chromosome and replicate independently of it. They generally carry only a small number of genes, notably some associated with antibiotic resistance.
Plant Cell Animals Cell Bacterial Cell
Present Present Absent
Plasmids
Absent Absent Present
Plastids
32 more rows•
At times during a month, there is no moon visible from earth, even on a clear night. Which phase of the moon is this?
o third quarter moon
O full moon
O first quarter moon
O new moon
Answers
What happens if the mass of the elements is greater compared to smaller ?
Answers
Hello. More information is needed to answer your question accurately. However, I will try to help you in the best possible way
If you are referring to what happens if the mass of an atom is greater compared to an atomic number, we can say that there is nothing too much, since it is normal for the atoms to have a mass slightly greater than the atomic number. The mass of an atom can never be less than the number of protons added to the number of neutrons. An atom with greater mass has a greater number of electrons and neutrons in relation to an atom of less mass and it is likely that the atom of less mass will donate or share electron with the atom of greater mass so that both reach the electric balance.
SOMEONEEEEEE PLEASE HELP ILL GIVE 20 POINTSZ!
Answers
Answer:
YOU SAID 20 POINTS AN DYOU GIVEN ME 5 HUN NO THANK YOU BYE
Explanation:
ANSWER;20
What genes give cell the instructions
of what to differentiate into?
A. master control genes
B. enzyme genes
C. RNA
Answers
Answer:
This are the master control genes.
A. master control genes
In genetics, a master regulator is a gene at the top of a gene regulation hierarchy, particularly in regulatory pathways related to cell fate and differentiation.Master regulatory refers to a substance or process that regulates or controls another. In genetics, a master regulatory gene codes for a factor capable of regulating expression of another (downstream) gene.How they work?
They produce proteins that act as transcription factors to produce proteins specific to the function of the particular cell type. They are often capable of changing some fully differentiated cells of different types into their particular cell type.Thus, option A is correct.
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What are examples of convections currents? What are examples of convection currents? A: the movement of war air into cooler air and cooler air into warmer air B: the movement of cool water into warmer water and warmer water into cool water. C: the displacement of air/water molecules by other air/water molecules due to varying temperatures. D: all of the above
Answers
Answer:
C: the displacement of air/water molecules by other air/water molecules due to varying temperatures
HELP IM ON LIMITED TIME
During photosynthesis, plants convert sunlight into what substance to be used for energy?
Select one:
iron sulfide
carbon dioxide
oxygen
glucose
Answers
glucose is the answer because that causes energy
Answer:
The correct answer is glucose. During photosynthesis, plants use sunlight to convert carbon dioxide and water into oxygen and glucose, which is used for energy. Glucose is a simple sugar molecule that can be used by plants and animals for energy.
jpshindell13
Explanation:
4. Name one thing that might affect section B of the graph above.
5. Justify your reasoning for how it will affect that section.
Answers
One thing that can affect the section B in the given graph is Human greed.
What is exponential growth?When a population's per capita growth rate remains constant, regardless of population size, exponential growth occurs, causing the population to grow exponentially as the population increases.
Many seal populations are declining as a result of human avarice. Millions of seals were slaughtered in the past for their pricey meat, fat, and fur.
Because seals are blamed by fishermen for the loss in fish stocks, seals are still murdered in huge numbers in several nations.
Thus, this can affect section B of the graph.
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which role do plants play in the nitrogen cycle?
Answers
Answer:
C .they take up the usable forms of nitrogen found in the soil .
Explanation:
What features of eukaryotes provide additional opportunities for the regulation of gene expression compared to bacteria? Select all that apply. Select all that apply. interaction with external environment transcription and translation are coupled processes separated processes of transcription and translation presence of chromatin opportunity for posttranscriptional and pre-translational regulation activation of all genes in genome
Answers
Answer:
separated processes of transcription and translation presence of chromatin opportunity for posttranscriptional and pre-translational regulationExplanation:
Since there is no nucleus surrounding the genetic material in prokaryote cells, the transcription and translation processes occur simultaneously. Transcription stops when a protein is not necessary. So the control of protein synthesis is regulated by transcription and not translation. Once the transcription is on, all the following steps must follow it.
Transcription is the process that controls the genic expression in bacteria.
Eukaryotes do possess a nuclear membrane that separates the genetic material from the rest of the cell. The transcription process occurs inside the nucleus membrane, while the translation process occurs outside. In the cytoplasm occur the translation process and protein synthesis. Genic regulation can happen in any of these processes in different regions of the cells.
In eukaryotes, the regulation of the genic expression control might happen at different levels:
Epigenetic level: When DNA molecules open and nucleosomes separate to join the transcriptional factorsTranscription level: When the messenger RNA is being transcriptedPost-transcription level: When mRNA goes to the cytoplasm Translation level: During the protein elongationPost-translation level: Once the protein synthesis is over.How Much Of The Suns Energy That Comes To Earth Is Used In Photosynthesis? What Happened To The Rest Of The Energy?
Answers
Answer:
Of all the energy that does reach Earth, slightly less than 34 percent is reflected back to space by clouds. The Earth itself reflects another 66 percent back to space. Less than one percent of the total energy that reaches Earth is used by plants for photosynthesis.
Explanation:
As a discussed in the lesson, eukaryotic cels are differ from prokaryotic cells based on what three things?
Answers
Answer:
Like a prokaryotic cell, a eukaryotic cell has a plasma membrane, cytoplasm, and ribosomes, but a eukaryotic cell is typically larger than a prokaryotic cell, has a true nucleus (meaning its DNA is surrounded by a membrane), and has other membrane-bound organelles that allow for compartmentalization of functions
Cytokinesis in animal cells is accomplished by constriction of the cell along the plane of cell division (formation of a cleavage furrow).
a. True
b. False
Answers
Answer:
A) True
Explanation:
Cytokinesis can be regarded as a physical process which brings about cell division, that enables division of cytoplasm of parental cell and turn it two daughter cells. It can take place with both mitosis and meiosis concurrently which are nuclear division that occurs in animal cells. Cytokinesis In animal cells can be achieved as a result of of formation of cleavage furrow by a contractile ring of microtubules of the cell, which brings about division of cell membrane to half.
The microtubules which is utilized during cytokinesis are ones that are been generated at early stages of division and they have a part to play in the restructuring of the new cell
In the digestive system, what part of the body precedes the large intestine?
O A. Esophagus
OB. Stomach
O C. Small intestine
O D. Mouth
Answers
In the digestive system, small intestine of the body precedes the large intestine. Therefore, option (C) is correct.
What is small intestine?The small intestine is a long, narrow tube-like organ that is part of the digestive system in humans and other animals. It is located in the abdominal cavity between the stomach and the large intestine, and is approximately 6 meters (20 feet) long in adult humans.
The primary function of the small intestine is to digest and absorb nutrients from food. It accomplishes this through the action of enzymes and other digestive secretions produced by the pancreas and liver, as well as through the action of tiny finger-like projections called villi and microvilli that line the intestinal walls. These structures increase the surface area of the small intestine, allowing for efficient absorption of nutrients into the bloodstream.
The small intestine plays a critical role in maintaining overall health and well-being by ensuring that the body receives the necessary nutrients to support its various functions.
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In dogs, gums can be pink - P (dominant), black- B (dominant), and pink with black spots. Write the genotypes for the following phenotypes .
Answers
In genetics, capital letters are used to represent dominant traits and lowercase letters are used to represent recessive traits. Therefore, in this case, the genotypes for dogs with pink gums would be BB and Bb, the genotypes for dogs with black gums would be BB and Bb, and the genotypes for dogs with pink gums with black spots would be Bb.
For example, a dog with pink gums and black spots could have the genotype Bb, indicating that it has inherited the dominant B allele (black gums) from one parent and the recessive b allele (pink gums) from the other parent. The presence of the pink gums with black spots phenotype indicates that the dog has inherited the b allele from one parent, which causes the pink gums with black spots phenotype to be expressed.
in developing countries, which of the following is predicted to happen to both population and demand for meat and milk?
A. it will double by 2050
B. it will decrease by 2050
C. it will stay the same in 2050
D. it will increase slightly by 2050
Answers
Angelman syndrome is caused by a mutation in a paternally imprinted gene on chromosome 15. Which of the following statements is true? Select all that apply. Deletion of the paternal gene copy (but normal maternal copy) could produce the syndrome Children of affected females have a 50% chance of showing the syndrome Meiotic nondisjunction of a normal paternal chromosome 15 accompanied by loss of a normal maternal chromosome 15 in a zygote could produce the syndrome Meiotic nondisjunction of a normal maternal chromosome 15 accompanied by loss of a normal paternal chromosome 15 in a zygote could produce the syndrome Children of affected males have a 50% chance of showing the syndrome Deletion of the maternal gene copy (but normal paternal copy) could produce the syndrome
Answers
The following statements are true for the production of Angelman syndrome:
2. Children of affected females have a 50% chance.
3. Meiotic nondisjunction of a normal paternal chromosome 15 accompanied by loss of a normal maternal chromosome 15
6. Deletion of the maternal gene copy
The mutated or missing maternal copy of a portion of chromosome 15 causes Angelman syndrome. Most of the time, it is because of the gene UBE3A, which is on chromosome 15 at the 15q11 to 15q13 locus. It encodes the ubiquitin protein, which is necessary for the electron transport chain and various functions of the cell membrane.
In most cases, this father-inherited gene is deactivated in the cortex, thalamus, and hippocampus of the brain. In these regions, the only source of genetic information for ubiquitin synthesis is the maternal gene. Therefore, neurological symptoms result from any mutation or deletion of this gene or a portion of chromosome 15 in the maternal gamete. The offspring are unaffected by mutations in the paternal gamete.
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List advantages and disadvantages of using scientific models.
Answers
Answer:
Explanation:
disadvantages:
Models do not behave exactly like the things they represent. Accuracy—In order to make models simplistic enough to communicate ideas some accuracy is lost. For example, ball and stick models of atoms do not show all the details that scientists know about the structure of the atom.
advantages:
When students are engaged in scientific modeling, they are able to notice patterns and develop and revise representations that become useful models to predict and explain--making their own scientific knowledge stronger, helping them to think critically, and helping them know more about the nature of science.
The advantage of a scientific model is it allows complicated processes to be predicted and simplified. A model's drawback is that it could be deceptive and open to numerous interpretations.
What is a scientific model?The advantages are:
Students who participate in scientific modeling are better able to identify patterns and create and revise representations that become useful models to predict and explain, strengthening their own scientific knowledge and fostering critical thinking. They also gain a better understanding of the nature of science.The disadvantages are :
Models don't always act the same as the things they're meant to represent. Accuracy—Some accuracy is lost when models are simplified to the point where they can convey concepts. For instance, the specifics that scientists are aware of regarding the structure of the atom are not depicted in full by ball and stick representations of atoms.Thus, the advantage and disadvantages are written above.
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5. How does the current leaving the cell in a parallel circuit compare
with the current in a series circuit, if both circuits have the same
type of cell and the same number of identical flashlight bulbs?
Answers
Answer:
circuit compare
with the current in a series circuit, if both circuits have the same
type of cell and the same number of identical flashlight bulbs?
By the end of the Jurassic Period, the Sundance Sea was filled up with sediments and formed a swampy lowland known as
Morrison Foredeep
Panthalassa Moor
Franciscan Terrane
Great Black Swamp
Solenhofen Swamp
Answers
Answer:
Morrison Foredeep
Explanation:
Morrison Foredeep is a swampy lowland formed due to filling of Sundance Sea with sediments during Jurassic period. Series of sedimentary rocks deposited during the Jurassic Period in the western North America, from Montana to New Mexico. Morrison Formation is famous for the presence of dinosaur fossils, which have been collected since 1877 about more than a century ago beginning with a find near the town of Morrison, Colorado.
From the list below, select ALL of the structures that are part of the sexual life cycle of Basidiomycota. [Do not select any structures that are part of asexual reproduction.) Conidia Ascospore Basidiospore Zygospore Rhizopus sporangium Conidiospore Ascus Basidium
Answers
Basidiospore, Basidium, Ascus are the structures that are part of the sexual life cycle of Basidiomycota.
Basidiomycota are a group of fungi that reproduce sexually through a process called basidiomycetous reproduction. In this process, the fungi produce special reproductive structures called basidia, which are located on the surface of the fruiting body (also known as the basidiocarp). The basidia contain special cells called basidiospores, which are released when the basidia mature and burst. The basidiospores are then carried away by wind or other means and can germinate to form new fungal cells. The process of basidiomycetous reproduction also involves the formation of asci, which are special cells that contain ascospores. These ascospores are produced through meiosis and can give rise to new fungal cells when they germinate. The structures listed above that are NOT part of the sexual life cycle of Basidiomycota include conidia, conidiospores, zygospores, and rhizopus sporangium, which are all involved in asexual reproduction.
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Both Mrs. Smith and Mrs. Jones had babies the same day in the same hospital. Mrs. Smith took home a baby girl named Shirley. Mrs. Jones took home a baby girl named Jane. Mrs. Jones began to suspect, however, that her baby had been accidently been switched with the Smith baby in the nursery. Blood tests were made. Mr. Smith was blood type A, Mrs. Smith was type B, Mr. Jones was type A, Mrs. Jones was type A. Shirley was type O, and Jane was type B. Had a mix-up occurred? SHOW WORK!
Answers
Answer:
yes a mixup had occured because two A blood types would result in a baby with the same blood unle mr.jones wasnt the father
Explanation:
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Answers
Nucleus: Control center of the cell; contains DNA
Ribosomes: makes proteins inside cell
Cell membrane: protective layer of the cell
Hope this helps :)
Mitochondria: source of energy to cell
Nucleus: contains dna and controls center
Ribosomes: produces protein
Cell membrane: gives protection