Species are threatened by habitat _____
a. fragmentation
b. degradation
c. destruction
d. all of these
D
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Which type of medium typically contains an indicator dye?
A) selective but not differential B) differential but not selective C) both selective and differential D) neither selective nor differential
The physiologist J. Soum surgically sealed off an air sac of a pigeon and injected carbon monoxide into it. What did he observe and conclude from this experiment?
A. The bird died demonstrating the toxicity of this gas. B. The bird was fine, demonstrating this gas is not actually toxic. C. The bird died, indicating diffusion of gases across the air sac into the blood. D. The bird showed no ill effects, indicating diffusion of gases from the air sac into the blood. E. The bird showed no ill effects, indicating gases do not diffuse from the air sac into the blood.
Which statement is least consistent with the beliefs of Lamarck?
a. “Fluida” moves into areas of the body in need of change. b. Acquired characteristics are inherited. c. Giraffes' necks have become longer in response to stretching. d. Environmental pressures bring about changes in organisms. e. Changes in an individual are not passed to its offspring.
Which part of the sperm cell contains enzymes to help the sperm digest a pathway into the egg?
A. centriole B. acrosome C. body D. head E. tail