Endocytosis and exocytosis are forms of active transport. What is active transport? (1 point)
the movement of molecules up a concentration gradient from low to
high, using no energy
the movement of molecules down a concentration gradient from
high to low, using energy
the movement of molecules down a concentration gradient from
high to low, using no energy
the movement of molecules up a concentration gradient from low to
high, using energy

Select the correct answer. which of the following statements is a scientific claim? a. the early solar system had large amounts of water; so, the oldest objects in the solar system should also be abundant in water. b. the mass of the universe is much greater than current models predict; it is not possible to explain this inconsistency. c. planet earth is abundant in water, but there is no way to scientifically determine from where earth's water originated. d. earth is shaped like a sphere even if not all of the scientific observations related to its shape support this idea.