The struggle for the civil rights
Mammals are adapted to live in land, air, and water, so the answer is D, all of the above.
Phospholipids : This makes up the bi-layer which is the membrane's basic structure and has great control over what can enter and exit the cell, due to their hydrophobic tails and hydrophilic heads.
Cholesterol : This also controls entry and exit of substances as it also exhibits hydrophilic heads and hydrophobic tails. It also stabilises the membrane and affects its fluidity (the more there is, the more fluid is the membrane.)
Glycolipids : Those can act as receptor molecules (essential for cell-signalling), antigens and in cell-adhesion
