Good question vary good question but I think the blood never mix because One of the placenta's jobs is to make sure blood from the mother and fetus never mixes. The placenta acts as an exchange surface between the mother and the fetus. Nutrients and oxygen are passed over by diffusion only. If the mother's and fetus's blood mixed, it could be deadly for both of them. I hope I helped you and am sorry if it’s too late I just ate to much sugar it is like 11 at the night but still I helped you and that’s good. Good luck
A gas is given off when two substances are mixed.
<u>physical change: A copper rod is hammered into a thin sheet. </u>
A solid forms when two clear liquids are mixed.
A matchstick changes color when it burns.
explanation
a physicals change vs chemical
physical change is like cutting, changing shape etc, it the molecules that make it and the chemicals of it stay same
chemical change when it chemically changed such as cooking meat
Answer:
The rules of base pairing explain the phenomenon that whatever the amount of adenine in the DNA of an organism, the amount of thymine is the same. Similarly, whatever the amount of guanine, the amount of cytosine is the same.
Hope it helps a lil! ^_^
Explanation:
example of cell differentiation is the development of a single-celled zygote into a multicellular embryo that further develops into a more complex multisystem of distinct cell types of a fetus.
Function schme D N.A research.cancer treatment