A toad avoiding bad-tasting insects is an example of a(n)
A) innate behavior. B) random behavior.
C) instinctive behavior. D) learned behavior.
D
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A cell that responds to an environmental condition by the release of a chemical is an example of which of the following elements of cellular communication?
A. a signaling cell B. a signaling molecule C. a receptor molecule D. a responding cell E. None of these choices is correct.
At some point during development, all members of the ____ phylum have a hollow dorsal nerve cord, a perforated
pharynx, a notochord, and segmented muscles in both the body wall and postanal tail.
a. Hemichordata b. Echinodermata c. Cnidaria d. Arthropoda e. Chordata
What happens first following a neuronal stimulation?
a. Sodium ions enter the cell. b. Sodium ions leave the cell. c. Potassium ions enter the cell. d. Potassium ions leave the cell. e. Potassium ions are involved in positive feedback.
Which of the following is the study of the geographic distribution of species on Earth?
A. comparative anatomy B. biogeography C. paleontology D. comparative embryology