What is the Bilayer made of phospholipids + proteins Surrounds all living cells controls the cell's contact with the environment Membranes are

What is the Bilayer made of phospholipids + proteins •Surrounds all living cells controls the cell's contact with the environment •Membranes are selectively permeable -They control the flow of substances into and out of a cell•Membranes organize the chemical reactions making up metabolism •Membranes are dynamic