Which of the following is not a camouflage device?
a. chromatophores
b. iridophores
c. thigmotaxis
d. obliterative countershading
C
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The longer and the thicker the vocal cords the _____________.
a.) louder the sound of the voice b.) higher the pitch of the voice c.) lower the pitch of the voice d.) softer the sound of the voice
Currents in the ocean basins of the Northern Hemisphere always run in what direction?
A. counterclockwise B. clockwise C. north to south D. from the equator to the poles E. from the poles to the tropics
Cutting off the tails of mice over several generations should cause the tails of their offspring to become shorter, according to the ideas of which of these scientists?
A. Darwin B. Wallace C. Lamarck D. Lyell E. Cuvier
The primary purpose of the Articles of Confederation was to
A: provide tax revenues for the national government B: establish the basic framework of the national government C: give the national government the power to regulate interstate commerce D: establish the supremacy of the national government over the states