Question

the cell membrane consists of two layers of phospholipids. the head of each phospholipid is made of a phosphate group, a molecule that is negatively charged and polar. this makes the head hydrophilic, or water loving, so it is attracted to other polar molecules like water. the tails are uncharged, nonpolar fatty acid chains. they are hydrophobic, or water fearing, so they repel most polar molecules. complete the paragraph to describe the phospholipid bilayer. both the intracellular and extracellular environments contain water. the water the phosphate - containing heads and the fatty acid tails of the phospholipids. so the heads of the phospholipids face, and the tails face in the lipid bilayer. outward inward

Explanation:

Since water is polar and the phosphate - containing heads of phospholipids are hydrophilic (water - loving), water attracts the phosphate - containing heads. Since the fatty acid tails are hydrophobic (water - fearing), water repels the fatty acid tails. In the lipid bilayer, the hydrophilic heads face outward (towards the water - containing environments) and the hydrophobic tails face inward (away from the water).

Answer:

attracts; repels; outward; inward