A cell wall and a cell membrane are different. All cells are surrounded by a that is and interacts with the environment.

Cell Membrane---Semi-permeable

Explanation:

All cells have cell membranes, regardless of the type, and they are all semi-permeable, or selectively permeable, which means they can regulate what enters and leaves the cell.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.