Measurements of bill length in a population of seed-eating birds reveals two distinct groups: small-billed individuals feeding on soft-shelled seeds and large-billed individuals feeding on hard-shelled seeds
This bimodal distribution most likely resulted from A) stabilizing selection.
B) natural selection.
C) directional selection.
D) disruptive selection.
D
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The methanobacteria, halobacteria, and sulfobacteria are included in which domain?
A) eubacteria B) protista C) blue-green algae D) archaea E) all of the above
The animals that remain isosmotic to the surrounding seawater are called:
a. osmoconformers. b. osmoregulators. c. hyperosmotic. d. hyposmotic. e. euryhaline.
Which one of the following divisions of the nervous system predominates during the relaxed state?
A) sensory division B) sympathetic division C) somatic division D) parasympathetic division E) endocrine division
You try to start your car, but it does not start. Which of these is a prediction?
A) My car's battery is dead. B) If I recharge the battery, then my car will start. C) My car is too old to function properly. D) What is wrong with my car?