Sperm pass through several stages during their development. The earliest stage in which the cell
becomes haploid is the
a. sperm.
b. spermatid.
c. primary spermatocyte.
d. secondary spermatocyte.
e. spermatogonium.
D
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The principle of parsimony states that
a. the simplest pathway is most likely correct. b. complexity is the key to truth. c. the more members there are in the clade, the more likely it is a true clade. d. derived characters are those shared by ancestral groupings. e. most answers are incorrect
Which of the following does NOT influence the pH of the blood and extracellular fluids?
a. respiration b. blood proteins c. bicarbonate ions d. filtration by glomerulus e. phosphate and ammonia ions
Glomerulonephritis will lead to
a. kidney stones. b. bladder infections. c. kidney cysts. d. inflammation of the urethra. e. little or no filtering of the blood
The ozone layer can be destroyed by pollutants such as
A) sulfur dioxide. B) CFCs. C) carbon monoxide. D) hydrocarbons and nitrogen oxides. E) carbon dioxide and oxygen.