Help please! in a cell's membrane, the phospholipid heads point outward toward the environment and toward the interior of the cell. why is this arrangement of phospholipids important in regulating interactions with its surroundings?

the polar heads can interact with water and other charged particles.

the hydrophilic heads help keep the cell moist by attracting water.

the polar heads help the cell stick to other cells of similar type.

the positively charged heads repel all negatively charged particles.