Baby ducks can be taught to behave as though a human investigator was their mother by providing the appropriate stimulus during a sensitive period. This form of learning is called
A) habituation.
B) altruism.
C) classical conditioning.
D) imprinting.
E) fixed action behavior.
D
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Which animal is used as an early warning system for encephalitis?
A. armadillos B. mice C. chickens D. foxes
The changes that were necessary to cope with the heavy energy demands of flight in birds include all of the following except
A. efficient respiration. B. efficient circulation. C. endothermy. D. auxiliary air sacs and hollow bones. E. a three-chambered heart.
What is responsible for the selective permeability of a cell membrane?
a. the position of cholesterol in the membrane bilayer b. the integral proteins of the membrane c. the hydrophobic core formed by the phospholipid tails d. the hydrophilic end facing the cell exterior
The type of reproductive barrier that occurs when reproductive structures of different species are physically incompatible is referred to as ____
Fill in the blank(s) with the appropriate word(s).