<span>The cell membrane acts as the gatekeeper of the cell, determining what goes in and out.</span>
Dude...you just want someone to do it for you..? Or..?
The answer is c on a different question
Answer:
A hydrogen atom is an atom of the chemical element hydrogen.Carbon is a chemical element with the symbol C and atomic number 6. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds.
In chemistry, an element is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei.
Explanation:
