The plasma membrane is composed of a layer of phospholipids. The ends of the phospholipids face the extracellular and intracellular sides. The ends of the phospholipids face each other and form the core of the membrane. The inner part of the membrane is . The polar regions of the phospholipids are . The proteins and phospholipids move laterally through the membrane.

2

Explanation:

because

1. double

2. polar

3. non-polar

4. hydrophobic

5. hydrophilic

6. can

Explanation:

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.