Answer:
it may be based on there surrounding that they have adapted to .
<span>C. The transferred electron from lithium to fluorine provides each atom with a full outer energy level.</span>
Transport proteins (carrier proteins and channel proteins) allow substances into and out of the cell that cannot pass through the phospholipid bilayer (as they’re either to large, charged or not lipid soluble) by facilitated diffusion.
Specifically channel proteins allow ions into and out of the cell by creating a pore in the membrane in which they can move through with their concentration gradient