State two reasons why the fetal blood must not mix with the maternal blood?
Answer:During pregnancy, red blood cells from the unborn baby can cross into the mother's blood through the placenta. If the mother is Rh-negative, her immune system treats Rh-positive fetal cells as if they were a foreign substance. The mother's body makes antibodies against the fetal blood cells
Explanation:
The normal body temperature of an adult human is between 36.1°C and 37.2°C. The normal body temperature of an adult chicken is between 40.6°C and 41.7°C. Based on this information, do you think most human enzymes and chicken enzymes have identical structures? Explain why or why not.
Answer:
Almost 60% of chicken genes correspond to a similar human gene. Although, researchers uncovered more small sequence differences between corresponding pairs of chicken and human genes, which are 75% identical on average, than between rodent and human gene pairs, which are 88% identical on average
Explanation:
How can you test the idea that solar energy is required for the reduction of NADP+ to NADPH?
Answer:
In addition to biology, evidence drawn from many different disciplines, including chemistry, geology, and mathematics, supports models of the origin of life on Earth. In order to determine when the first forms of life likely formed, the rate of radioactive decay can be used to determine the age of the oldest rocks (see optional problems C and D, below) exposed on Earth’s surface. These are found to be approximately 3.5 billion years old. The age of rocks can be correlated to fossils of the earliest forms of life. A. The graph compares times of divergence from the last common ancestor based on the fossil record with a "molecular time" constructed by comparing sequences of conserved proteins to determine a mutation rate (after Hedges and Kumar, Trends in Genetics, 2003). Explain how such a molecular clock could be refined to infer time or the evolution of prokaryotes. B. Using a molecular clock constructed from 32 conserved proteins, Hedges and colleagues (Battistuzzi et al., BMC Evol. Biol. 2004) estimated the times during which key biological processes evolved. A diagram based on their work is shown. Connect the time of the origin of life inferred from this diagram with the age of the oldest fossil stromatolites and the age of the oldest exposed rock to show how evidence from different scientific disciplines provides support for the concept of evolution. Evaluate the legitimacy of claims drawn from these different disciplines (biology, geology, and mathematics) regarding the origin of life on Earth. The oldest known rocks are exposed at three locations: Greenland, Australia, and Swaziland. The following application of mathematical methods provides essential evidence of the minimum age of Earth.
Explanation:
What determines cell differentiation once gene regulation has taken place?
A.
proteins
B.
adenosine triphosphates
C.
mitochondria
D.
fluids
pls helppp
Answer:
A. Proteins
[Hope this helped, good luck!]
Explain the process of evolution by natural
selection.
Answer:
Natural selection is a process where organisms that are better adapted to an environment will survive and reproduce. This means that the advantageous alleles of this variant organism are passed on to offspring. Over many generations, the process of natural selection leads to evolution occurring.
Explanation:
this should give you your answer but if not please tell me
1. The 1930s Dust Bowl in the Great Plains was caused by (1 point)
(O pts) deforestation.
0 (0 pts) contour plowing.
0 (0 pts) using renewable resources.
(1 pt) poor farming practices.
Answer:
poor farming practices
Explanation:
please help me.
thank you in advance
Answer:
At the edge of tectonic plates
Explanation:
An earthquake is typically caused by the collisions of tectonic plates, so they are more common at the plates' edges.
Which of these is an example of a chemical change?
O A. Dissolving salt in water
O B. Melting loe
OC. Breakina tree branch
D. Burning a piece of wood
What are the 2 main groups into which cells are classified? What is the major difference
between them?
Answer:
Eukaryote and Prokaryote
Eukaryotes have a nucleus and prokaryotes don't
Answer:
Prokaryotic and Eukaryotic
Explanation:
Linnaeus' classification of life only included two categories: animals and plants. Which three kingdoms did he leave out? ( point)
O Insecta, Fungi, and Monera
O Monera, Bacteria, and Protista
O Fungi, Monera, and Protista
O Bacteria, Insecta, and Protista
Answer:
C
Explanation:
These are the three missing kingdoms
Fungi, Monera, and Protista are the three kingdoms he neglected to mention.
What Linnaeus classification?The Linnaean system is based on similarities in apparent physical qualities. This system is a hierarchy of taxa, from the kingdom to the species. Each species is given a unique two-word Latin name. The domain, which was just added and is a larger taxon, is smaller than the kingdom. Seven levels make up Linnaeus' hierarchical classification scheme. They are kingdom, phylum, class, order, family, genus, and species, in order of largest to smallest. Linnaeus created a hierarchy for nature in Systema Naturae. He suggested that the entirety of nature may be divided into three big categories known as kingdoms. Animals, plants, and minerals made up these three kingdoms. He categorizes each of these kingdoms.To learn more about Linnaeus classification refer to:
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what is the name used to refer to the clogged xylem tissue?
The name used to refer to the clogged xylem tissue is heartwood in contrast to sapwood, a term for the dead, clogged xylem cells near the center of a tree. Heartwood has been the tree as the main column of support.
What is xylem?Xylem has been defined as the vascular bundle which has been used to transport water and other minerals from the root part to other parts of the plant. The main function of the xylem and phloem is to transport water and minerals from root to other parts of the plant.
The last common ancestor of the gymnosperms and angiosperms possessed the same characters such as the pollen, seeds, and the vascular tissue.The gymnosperms are a group of plant that are known as seed- producing plants such as Ginkgo, gnetophytes, cycads etc.
Angiosperms has been the plant that produces flowers and having seeds enclosed within their fruit. Gymnosperms have no production of flowers and fruits and they contain bare seeds on the surface of their leaves.
Therefore, The name used to refer to the clogged xylem tissue is heartwood in contrast to sapwood, a term for the dead, clogged xylem cells near the center of a tree. Heartwood has been the tree as the main column of support.
Learn more about xylem on:
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An engineer tests three new ceramic parts, each of which could potentially replace a steel part inside an automotive engine. The three parts, identical in size, are each made of a different ceramic compound. The parts are heated to the same temperature and placed under the same stress loads. At the end of the test, the engineer concludes Part B is the best for the job. What was the independent variable in this test?
Select one:
a. dimensions of the parts
b. temperatures to which the parts were heated
c. the engine used to test the parts
d. the composition of the parts
NEED ASAP PLEASE
Explain the difference between microscopic and macroscopic protozoa.
Answer:
Microscopic organisms can be seen only under the magnification(microscope) whereas macroscopic can be visible by naked eye.
Explanation:
help with biology please!
How do plants control homeostasis?
Answer:
it happens with they mind bro
Answer:
Angiosperms or flowering plants maintain homeostasis by keeping their stomata (opening in the underside of a leaf that allows carbon dioxide to diffuse into and out of the leaf) open just enough to allow photosynthesis to take place but not so much that they lose an excessive amount of water.
please give brainliest
The flow of carbon from one carbon source to another is considered a carbon ___.
A. sink
B. flux
C.store
D. site
WILL MARK BRAINLIEST
Answer:
C.store of manila philippines is most beautiful in the earth
Explanation:
I think that is the true answer in this question please hearts me in brainly and give me a star ⭐
The answer is A.
The carbon flow is from the source cells such as leaf to the sink cells such as fruits.
the external energy source for producers is ________ and the final energy-rich product produced in the mitochondria of consumers is ________.
Answer: the external energy source for producers is The sun and the final energy-rich product produced in the mitochondria of consumers is adenosine triphosphate (ATP).
The first one is: The sun
The second one is: adenosine triphosphate (ATP).
Explanation: I hope that's what you're looking for. Have a nice day studying.
which type of microscopy allows us to clearly view the internal contents of cell structures smaller than 200 nm?
Because the cell structures are so small, to clearly view them, requires a microscope that has a higher power of magnification than light microscopes can prove. This is usually an Electron Microscope.
Electron microscopy (EM) is a technique used to obtain high-resolution images of biological and non-biological specimens. It is often used to investigate the detailed structure of tissues, cells, organelles, and macromolecular complexes. (UMass Chan Med School Website)
an organism that captures and consumes another organisms for nourishment is called an?
Answer:
The organism is called a predator and the organism captured, a prey.
Answer:
predation I think
Explanation:
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which particles cannot pas through the cell membrane
Answer:
glucose, charged particles
Explanation:
how are the purposes of the digestive system and circulatory system linked?
Answer:
Explanation:
) Digestive System gets nutrients (good) from food and hands it over to the blood and Circulatory System then carries those nutrients where they need to go. (2) Filters out waste from food and pushes it through intestines and out the body (and you know how and where it gets out).
Where does protein synthesis begin?
Answer:
Protein synthesis occurs in the cytoplasm on ribonucleoprotein particles, the ribosomes.
Explanation:
hope it helps
what is the name of the tiny air sacs in your lungs?
Answer:
alveoli
Explanation:
6. The thick rigid layer that surrounds plant cells and provides support and structure is called the:
(a) Nucleus
(b)Mitochondria
(c) Cell wall
(d)Chloroplast
Answer:
C. Cell wall
Explanation:
The cell wall gives the cell its structure and protection. It also provides support to the cell by making sure nothing happens to it, and it is considered the outer layer of the cell and the layer is very thick and rigid.
what is the difference between a joint and a fault?
Answer:
Fractures include joints and flaws. A joint is a fracture along which there has been no movement, which is generally generated by tensional pressures. A fault is a fracture or break in the rock that has allowed movement to occur. Near faults, more earthquakes are likely to occur.
which type of cell produces new bone tissue by secreting matrix?
Answer:
Osteoblast
Explanation:
what color is the wild-type eye in d. melanogaster?
Answer: red-brown eye color
how can different amino acids affect secondary structure
Answer:
Exposure to positively charged amino acids (arginine and lysine) is found to clearly stabilize the secondary structure. Kinetically, each amino acid promotes folding by generating a large increase in the folding rate with little change in the unfolding rate.
the process of red blood cell production is called
Answer: Erythropoiesis
Explanation:
what is the final electron acceptor of the photosynthetic electron transport chain?
So, this are the required information on it. ☺