The major mechanism of evolution is

(a) species development.
(b) predation.
(c) fitness.
(d) natural selection.


(d) natural selection.

Biology & Microbiology

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The signal to "rest and digest" comes from the:

A. somatic system. B. parasympathetic system. C. peripheral system. D. sympathetic system.

Biology & Microbiology

Assess the merits of each action potential analogy; select the representation that corresponds most accurately.

A. An action potential happens like a ripple in a pond; a ripple spreads out and gets slightly weaker as it travels. B. An action potential happens like a row of dominoes falling; the signal has constant velocity and constant strength no matter how long the row of dominoes may be. C. An action potential happens like a crowd doing the wave in a football stadium; the enthusiasm and volume increase as more people get involved.

Biology & Microbiology

Which is a hormone that reduces blood volume and pressure by pulling more water out of the blood and increases urine volume?

A) erythropoietin B) atrial natriuretic hormone C) aldosterone D) renin

Biology & Microbiology

Generally speaking, vaccinations are effective in combating future infections because they induce the production of

A. mutations in the host genome. B. prostaglandins. C. helper T cells. D. neutrophils. E. memory cells.

Biology & Microbiology