Why would phospholipid heads in the cell membrane be hydrophilic? I know that makes inside and outsides of the cell membrane attracted to water, but according to google, it also means that the phospholipid heads "have a tendency to to mix with, dissolve in, or be wetted by water."

They have molecules that has a phosphate group on an end and it is called the head. The two-two fatty chain make the lipid tail. The phosphate is negative charged and makes the hydrophilic and head polar. And then the two head are attracted to water.

i dont know it at allnow im just getting points at this pint

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms