In which direction does the head of the molecules of the plasma membrane face?

When a doggo starts to pace around in the same line for a hand full of days. what would that mean?

Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins

Which environmental change would most likely result in bullfrog offspring that are able to store more water than bullfrogs in previous generations?