The orbit of a comet is:

very short
cyclical
irregular
unpredictable

Which of the following ocean acidification? are the most likely side effects of a ph less than 7.0 in the ocean b. more metal salts altering the ocean chemistry c. dissolution of the shells of marine organisms d. both a & b e. all of the above.

Enzymes affect the reactions in living cells by changing the

Which substance is a steroid? cholesterol fatty acid monosaccharide trans fat