Which of the following best explains how the fossil record provides evidence that evolution has occurred?
a. It shows that forms of life existed on Earth at least 3.5 billion years ago.
b. It shows the detail of structural and behavioral adaptations of organisms.
c. It shows how the embryos of many different vertebrate species are very similar.
d. It shows that the structure of groups of organisms have progressively changed over time.
Answer:
A It shows that forms of life existed on Earth at least 3.5 billion years ago.
Explanation:
AIt indicates that forms of life existed on Earth at least 3.5 billion years ago. It indicates the exact cause of structural and behavioral adaptations of organisms.
A new study in the Proceedings of the National Academy of Sciences that uses the latest techniques to date the most aged remains available, confirming the existence of bacteria and microbes nearly 3.5 billion years ago, possibly living on a planet without oxygen.
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Why DNA is absent in blood plasma?
Answer:
Why do blood cells not have DNA?
Because of the lack of nuclei and organelles, mature red blood cells do not contain DNA and cannot synthesize any RNA, and consequently cannot divide and have limited repair capabilities. The inability to carry out protein synthesis means that no virus can evolve to target mammalian red blood cells.
Explanation:
Blood plasma is a light amber-coloured liquid component of blood in which blood cells are absent but contains proteins and other constituents of whole blood in suspension. It makes up about 55% of the body's total blood volume. It is the intravascular part of extracellular fluid (all body fluid outside cells). It is mostly water (up to 95% by volume) and contains important dissolved proteins, hormones, carbon dioxide (plasma being the main medium for excretory product transportation), and oxygen. It plays a vital role in an intravascular osmotic effect that keeps electrolyte concentration balanced and protects the body from infection and other blood-related disorders.
Blood plasma is separated from the blood by spinning a tube of fresh blood containing an anticoagulant in a centrifuge until the blood cells fall to the bottom of the tube. The blood plasma is then poured or drawn off. For point-of-care testing applications, plasma can be extracted from whole blood via filtration or via agglutination to allow for rapid testing of specific biomarkers. Blood plasma has a density of approximately 1,025 kg/m3 (1.025 g/ml).
Blood serum is blood plasma without clotting factors.
Plasmapheresis is a medical therapy that involves blood plasma extraction, treatment, and reintegration.
Fresh frozen plasma is on the WHO Model List of Essential Medicines, the most important medications needed in a basic health system. It is of critical importance in the treatment of many types of trauma that result in blood loss and is therefore kept stocked universally in all medical facilities capable of treating trauma.
Why are the components of the electron transport chain embedded in the inner mitochondrial membrane rather than floating freely in the cytoplasm of mitochondrial matrix?.
Answer:
To generate and maintain the proton gradient essential for ATP production.
Explanation:
ATP is also formed from the process of cellular respiration in the mitochondria of a cell. This can be through aerobic respiration, which requires oxygen, or anaerobic respiration, which does not. Aerobic respiration produces ATP (along with carbon dioxide and water) from glucose and oxygen.
How is a balloon like
a cell membrane?
Answer:
As the plasma membrane, the balloon is a SEMIPERMEABLE MEMBRANE. Semipermeable means that the membrane allows the movement of certain molecules across. Both in and out of the balloon.
class 6 students come here I will give you notes class is started come here fast I am waiting come with your name and class girls i am also girl
Answer:
yes mam I am present in your class.
Select the statements that correctly describe how a new DNA molecule reflects the original DNA molecule from which it was copied. Select the TWO answers that are correct.
a. DNA replication proceeds in a 5' to 3' direction in the new DNA molecule and in the opposite direction in the original.
b. The nitrogenous bases in the new DNA molecule are A, T, G, and C, but the original molecule contains A, U, G, and C.
c. Each new DNA molecule contains an original strand and a newly synthesized strand.
d. The two DNA molecules are exact opposites of each other according to base pairs.
e. Base pairing rules duplicate the base pairs of the original molecule in the new molecule.
Answer:
a. DNA replication proceeds in a 5' to 3' direction in the new DNA molecule and in the opposite direction in the original
c. Each new DNA molecule contains an original strand and a newly synthesized strand.
Explanation:
DNA replication is an important process every cell must undergo prior to division. DNA replication is the process whereby DNA content is doubled. It occurs as a result of an enzyme called DNA polymerase, which synthesizes nucleotides.
DNA replication follows the semi-conservative model which uses one original DNA strand to synthesize a new DNA strand. The double-stranded DNA is separated into two single strands which serve as template for new strands. Due to the action of DNA polymerase, DNA replication proceeds in a 5' to 3' direction in the new DNA molecule and in the opposite direction in the original.
Also, each newly synthesized DNA molecule which is similar to one another contains an original strand (template) and a newly synthesized strand.
A polypeptide is another name for the basic structure of a:.
Which dark solar feature is shown in the picture above?
Solar flare
Prominence
Sunspot
Corona
Answer:
corona is dark solar feature I think
Which environmental change occurs most rapidly?
human population growth
forest succession
tornado
decomposition
Answer:
Tornado
Explanation:
I took the test :D
Answer:
c. tornado for K12
Two chemical equations are shown below.
maltose + water 4 glucose + glucose
fat + water B glycerol + fatty acids
What do letters A and B represent?
A) A - lipase; B - protease
B) A - protease; B - maltase
C) A - maltase; B – lipase
D) A - maltase; B - protease
Answer: C is the answer to this question.
why do we have so much dna?
Answer:
Of the trillions of cells that compose our body, from neurons that relay signals throughout the brain to immune cells that help defend our bodies from constant external assault, almost every one contains the same 3 billion DNA base pairs that make up the human genome – the entirety of our genetic material. It is remarkable that each of the over 200 cell types in the body interprets this identical information very differently in order to perform the functions necessary to keep us alive. This demonstrates that we need to look beyond the sequence of DNA itself in order to understand how an organism and its cells function.
Explanation:
Which of the following are ways humans have contributed to the rise in carbon dioxide in the lower atmosphere?
A. Through the burning of vehicle fuels
B. Through the use of fossil fuels in manufacturing
C. By clearing of the rainforest
D. All of the above
Answer:
it is D. all of the above
Explanation: all of these things contribute to rising carbon dioxide levels in the atmosphere
Answer: D. All of the above
Give an example of a protein for each of the functions of proteins.
(Support –Metabolism – Transport –Defense – Regulation – Motion)
Explanation:
Support- Actin filaments which allows movement of the cell surface.
Metabolism- insulin, which is small globular protein having two chains.
Transport- sodium-potassium pump, which is transport protein. It creates the gradient of ion that allows firing of the neurone.
Defense- Antibodies
Regulation- activator proteins that bind to regulatory site of the DNA
Motion- Actin filaments
Goodmorning, can someone please help me figure this out? Thanks
Answer:
Vacuole.
Hope this helps!
Explanation:
Which strand is the shortest??
How is an HIV infection different from a cold virus infection?
A. HIV is killed by macrophages.
B. HIV is a bacteria.
C. HIV is a lipase.
D. HIV attacks helper T cells.
Answer:
HIV attacks helper T cells.
Explanation:
The correct answer is that HIV attacks helper T cells, while a cold virus infection does not. That is in Option D, as an HIV (human immunodeficiency virus) infection and a cold virus infection are caused by two different types of viruses.
What is HIV?HIV is a retrovirus, which means that it contains RNA as its genetic material instead of DNA. When the virus infects a host cell, it uses an enzyme called reverse transcriptase to convert its RNA into DNA, which is then integrated into the host cell's genome. This allows the virus to hijack the host cell's machinery and produce more copies of itself, which can then infect other cells in the body. One of the main targets of HIV infection is the CD4+ T cell, also known as the helper T cell. Helper T cells play a key role in the immune system by helping to activate and coordinate other immune cells, such as B cells and cytotoxic T cells.
Hence, the correct answer is that HIV attacks helper T cells, while a cold virus infection does not. That is in Option D.
Learn more about HIV here.
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What are details/evidence of a Prokaryotes? please help and thank you.
Answer:
Prokaryotic cells are much smaller than eukaryotic cells, have no nucleus, and lack organelles. All prokaryotic cells are encased by a cell wall. Many also have a capsule or slime layer made of polysaccharide. Prokaryotes often have appendages (protrusions) on their surface.
A feeding strategy used by animals that strain their food and nutrients from the surrounding water.
A hunting
b siphoning
c filter feeding
d grazing
Answer:
I think it is D, grazing
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I will give you brainliest
Answer:
2nd to view the cells of the skin
How is the idea of PTT related to the
locations and distribution of volcanoes,
earthquake epicenters and mountain ranges?
Answer and Explanation:
The mantle is one of the four layers that form the earth. It is a very hot and dense rock, that is capable of flow. The crust is the outermost layer of the earth and is located just over the mantle. The crust is divided into many plates, that are able to move over the mantle.
The tectonic plates theory, PTT, is based on the continual movements of the crust and might explain the movement of the different plates, and their directions and interactions.
Plates are limited by three different ridges or borders that differ in the type of movement they produce.
Divergent limits: where two plates get separated, leaving a space among them that make a place for a stream of hot material that comes from the mantle to create a new seabed. This separation occurs because of the sea bottom expansion. As old plates get separated, the new and young crust instantaneously gets formed. There is never an open space left, because the emerging mantle occupies that place. This process occurs along with an underwater mountain range which is known as the mid-oceanic ridge or divergent ridge. An example of this is the ridge located in the middle of the Atlantic Ocean, extending from Greenlander to the southernmost point of South America. These divergent limits are in general associated with the rocky material involved in the expansion of the seafloor.
Convergent limits: These movements occur when two plates collide. It might occur among two oceanic plates or one oceanic and one continental plate. In this last case, the oceanic plate is always the one that subducts. The thicker and older plate subduces under the other plate, and at this point, it starts the volcanic activity. As the thicker plate descends, it is heated and melted and its materials are incorporated into the mantle. As the older plate subducts, all the sedimental material that was on the surface of this plate, accumulate and incorporate into a wedge-shaped mass known as an accretion prism. The fast subduction and accretion prism formation make a place for magma that ascends to the surface by crevices. This produces the formation of the volcanic arches, located behind the accretion prism. If these arches are formed on the continental plate, these formations are known as continental arches. But if they occur in another oceanic plate, the arches are known as volcanic island arches. The volcanic islands are arranged in a circumference arch shape, which is bordered by a fossa. Subduction zones coincide with deep-sea trenches or depressions in the ocean bed. The Mariana Islands in the Pacific Ocean are examples of these volcanic islands. The Nazca plate is another example oceanic plate subducting under the south American plate and originating the Andes mountains.
Transforming limits refer to geological structures related to the seafloor expansion and associated in general with the oceanic ridge, although they might also occur in the continental plate. These limits are known as geological faults, where no rocky material is either destroyed or formed. When the plates move and one of the transforming limits displace from side to side, earthquakes occur. The movement breaks the crust and originates pronounced fractures. The San Andrés fault is an example of this plate ridges.
the question is in the photo.
Answer:
A.) Complementary to the corresponding mRNA codon
Explanation:
A.) is correct because the anticodon is what connects the tRNA to the mRNA. To form a bond between these sequences, they must be complementary.
B.) is incorrect because it describes the other end of the tRNA molecule.
C.) is incorrect because it is complementary to the mRNA strand, not rRNA.
D.) is incorrect because the anticodon does not change its sequence.
Where would you expect to find the most genetic diversity among humans?(This is a multiple choice question)
A. in city
B. in a town
C. in a family
Answer:
In a city
Explanation:
Your family all shares DNA, and towns are small and have fewer people and the lack of people leads to a lack of diversity.
What percentage of species who ever lived are still alive today?
20
15
10
5
1
Answer:
20 is the correct answer
Explanation:
Read this some where
QUESTION 2
What organism is defined as a multicelled organism that develops through a series of stages and move
life?
O a archaea
Ob bacteria
c. fungi
d. animals
o e plants
Answer:
Animal
Explanation:
The loss of an organism at the bottom of a food chain negatively impacts all organisms in the chain.
Please select the best answer from the choices provided
Truth or false
Answer:
true
Explanation:
EMAI HTPC MER
correct arrange
Answer:
the correct is c
Explanation:
Drag the tiles to the correct boxes to complete the pairs.
Organisms compete for limited resources at many levels. Match each scenario to the type of competition it exhibits.
I'll mark brainliest!
Intraspecific direct:
all the gray wolves feed on the same type of preytwo male deers fight over a mateInterspecific, indirect:
A robin and a blue jay try to eat the same wormthe rise in one species of bird limits the nesting space for other speciesTypes of competitionCompetition is a type of interaction in which two or more organisms of the same or different species compete over common limited resources.
When the competition involves organisms of the same species, the competition is said to be direct or intraspecific.
On the other hand, if the competition for resources involves organisms of different species, the competition is said to be indirect or interspecific.
Thus, all gray wolves feeding on the same type of prey and two male deers fighting over a mate are examples of direct or intraspecific competition. In the same vein, a robin and a blue jay trying to eat the same worm and the rise in one species of bird limiting the nesting space for other species are examples of indirect or interspecific competition.
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Can someone help me with this
Answer:
no euejrbdjsjsh rhdhsbs
What is the difference between facilitated diffusion and active
transport?
A. Facilitated diffusion uses ATP and moves substances with the
concentration gradient; active transport does not.
B. Active transport uses ATP and moves substances against the
concentration gradient; facilitated diffusion does not.
C. Active transport uses ATP and does not require a carrier protein;
facilitated diffusion does neither.
D. Facilitated diffusion uses ATP and requires a carrier protein; active
transport does not.
Answer:
B.) Active transport uses ATP and moves substances against the concentration gradient; facilitated diffusion does not.
State one reason
scientists would value an experiment that does not support the initial hypothesis.
Answer:
An experiment that does not support the initial hypothesis would prove that the scientists initial thoughs were incorrect thus needing further investigation and experimentations.
Explanation: