How does the contractile vacuole in a single-celled organism function to maintain homeostasis?
a) it pumps water into the cell.
b) it pumps water out of the cell.
c) it pumps solutes into the cell.
d) it pumps solutes out of the cell.

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes

What causes eclipses? check all that apply. earth's rotation on its axis moon's shadow covering the sun earth's shadow covering the moon earth's orbit and moon's orbit occasionally aligning the moon and sun's gravity pulling in the same direction

Which statement describes how favorable traits in a population relate to natural selection? they are the only traits that ever exist in the population. they build in the population over time. they are rarely passed on to offspring. they are found only in a few individuals within the population.