Fossil footprints in Tanzania document the passage of a bipedal species ____ million years ago

a. 2.4
b. 3.0
c. 3.6
d. 4.2
e. 4.8


ANSWER: c

Biology & Microbiology

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. F. Skinner first introduced operant conditioning experiments. What happens in these experiments? 

A. An animal learns to associate its behavioral response with a fixed action pattern. B. An animal learns to associate its behavioral response with an instinct. C. An animal learns to associate its behavioral response with its biological clock. D. An animal learns to associate its behavioral response with a reward or a punishment. E. An animal learns to associate its behavioral response with a conditional stimulus.

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What does one call a mutation that occurs in a DNA sequence that changes the amino acid specified by that sequence?

What will be an ideal response?

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Which statement explains the general upward trend of the data over the 2-year time period?

A) Evaporation exceeded transpiration. B) Transpiration exceeded precipitation. C) Precipitation exceeded evaporation. D) None of these statements explains the upward trend.

Biology & Microbiology