Which of the following is (are) true of natural selection?
A) It requires genetic variation.
B) It results in descent with modification.
C) It involves differential reproductive success.
D) It requires genetic variation, results in descent with modification, and involves differential reproductive success.
D
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In the reaction A- +B ?A + B-, ____
A. molecule A is oxidized and molecule B is reduced. B. molecule A is reduced and molecule B is oxidized. C. molecules A and B are both reduced. D. molecule A is oxidized and molecule B is unchanged. E. molecules A and B are both oxidized.
The control in an experiment
a. makes the experiment valid. b. is an additional replicate for statistical purposes. c. reduces the experimental errors. d. minimizes experimental inaccuracy. e. is identical to the experimental group, but eliminates the characteristic or treatment being tested.
The total number of individuals in a population is the
population a. distribution. b. growth. c. birth rate. d. size. e. age structure.
Which of the following would be a secondary sexual characteristic?
A. testosterone produced by the testis B. the development of a menstrual cycle C. erection of the penis or clitoris D. the different amount and location of body fat in men and women