The statement which best explains why carbon is present in so many kinds of molecules is because <u>it can form four covalent bonds.
<em /></u>It isn't rare on Earth, so A is incorrect. It has valence electrons, so C is incorrect. It cannot become an ion, so D is incorrect.<u>
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The answer is D
Hope this help
Because it is polar and it is to large to cross the membrane and because the concentration gradients are to strong so they have to be diffused.
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This is about you lol we can’t answer this
Probably through a electron microscope either TEM or SEM. or possibly a picture through the microscope. I hope that helped.