The major mechanism of evolution is
(a) species development.
(b) predation.
(c) fitness.
(d) natural selection.
(d) natural selection.
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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.
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.
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
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.