Water changes forms frequently during the water cycle.
which is the formation of clouds ?
a.) precipitation falling from the atmosphere
b.) condensation occurring in the atmosphere
c.) runoff traveling downhill
d.) sunlight causing evaporation

Spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food

What substance acts to prevent sudden ph changes in bodily fluids?