In order to maintain its homeostasis, human cells must have a higher concentration of sodium ions outside the cell than inside the cell. in addition, the concentration of potassium ions must be higher inside the cell than outside the cell. which of the following forms of cellular transportation human cells maintain their sodium and potassium concentration?
a. diffusion
b. a cell membrane pump
c. osmosis
d. passive transport

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.