Darwin proposed natural _________, the idea that environmental conditions favor certain traits, as the mechanism of evolution.
Fill in the blank(s) with the appropriate word(s).
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The testes of a male differ from the ovaries of a female in that the testes
(a) develop in the body cavity and migrate to a position outside of the body cavity. (b) require a slightly higher temperature than that of the body to produce viable gametes. (c) produce zygotes. (d) do both a and b.
From what structure did vertebrate lungs originally evolve?
a. fish gills b. fish guts c. fish lungs d. fish throats e. fish kidneys
Energy flows in which pattern?
a. Sun ? environment ? consumers ? producers b. Sun ? environment ? producers ? consumers c. Sun ? consumers ? producers ? environment d. Sun ? producers ? consumers ? environment e. Sun? producers ? environment ? consumers
Microaerophiles are microbes that grow best at low
A. carbon dioxide levels. B. pH values. C. hydrostatic pressure. D. oxygen levels. E. salt concentrations.