The cell membrane A. Only allows materials to enter a cell
B. Separates the cell from the external environment
C. Is made of a single layer of lipids and phosphorus molecules
D. Is only present in eukaryotic cells.

This is what i found on google“ the monomers combine with each other via covalent bonds to form larger molecules known as polymers. in doing so, monomers release water molecules as byproducts. this type of reaction is known as dehydration synthesis, which means “to put together while losing water. in the process, a water molecule is formed.” i hope this you