About 25 of the 92 natural elements are known to be essential to life. Which 4 of these 25 elements make up approximately 96% of living matter?

A) carbon, sodium, hydrogen, nitrogen
B) carbon, oxygen, phosphorus, hydrogen
C) oxygen, hydrogen, calcium, nitrogen
D) carbon, hydrogen, nitrogen, oxygen


D) carbon, hydrogen, nitrogen, oxygen

Biology & Microbiology

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The active ingredient in Ecstacy is

a. MDA. b. MDMA. c. MMA. d. LSD. e. STP.

Biology & Microbiology

An excess of growth hormone in adults results in ____

a. gigantism b. pituitary dwarfism c. osteoporosis d. osteomalacia e. acromegaly

Biology & Microbiology

What might happen to your red blood cells if you were suddenly unable to regulate the solute concentration of your blood and it began to rise?

A) Your blood cells would stay the same size. B) Your blood cells would enlarge and could rupture because water would move into the cells via osmosis. C) Your blood cells would shrivel because water would move out of the cells via osmosis. D) We don't have enough information to answer this question.

Biology & Microbiology

The Greek root words for "branch" and "picture" form the biological term

A. binomial nomenclature. B. taxonomy. C. cladogram. D. systematics. E. phenogram.

Biology & Microbiology