The two upper chambers of the heart are called ________; the two lower chambers of the heart are called ________
Fill in the blank(s) with correct word
atria; ventricles
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Evolution is the result of selecting only those mutations that result in an increased reproductive success
Indicate whether the statement is true or false
Simberloff and Wilson carried out a famous experiment to study the recolonization by arthropods of small mangrove by islands after the islands were fumigated. One of their findings was
A. several species of birds were facilitators of recolonization. B. species turnover was high following recolonization. C. recolonization was identical on all of the islands regardless of size. D. species richness changes little following recolonization. E. high diversity relative to the mainland.
Swarming in polychaetes for reproduction appears to be timed by:
a. biorhythms of the animals. b. lunar cycle and tides. c. solar cycle and tides. d. temperature. e. current direction.
Muscle cells that are not exercised will atrophy, or shrink in size. Lou Gehrig's disease affects nervous tissue but also causes muscle atrophy. What type of nerve cell must be affected to cause this muscle-wasting condition?
A) neuroglial cells B) sensory neurons C) motor neurons D) interneurons