Differences in populations may arise over time when physical structures in the environment, such as mountains or large bodies of water, change. These structures are referred to as
A) Pangaea.
B) continental drift.
C) macroevolution.
D) geographical barriers.
E) micro-isolation bottleneck effect.
D
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A student sitting in the back row opened a bottle of foul-smelling perfume and dabbed it on her wrists. One by one (beginning from the back of the room) the students began to cough due to the foul smell. This phenomena was due to
A. an allergic reaction. B. osmosis. C. molecules moving from an area of low concentration to high concentration. D. diffusion. E. active transport.
Which of the following accurately compares active hyperemia to reactive hyperemia?
A) One is caused by an increase in metabolites, the other to a decrease in perfusion pressure. B) One is an increase in blood flow, the other is a decrease. C) One is caused by increased metabolic activity, the other in response to an increase in metabolites from an occlusion to blood flow. D) One involves vasodilation, the other vasoconstriction. E) One is an intrinsic response, the other an extrinsic response
The amount of guanine in an organism always equals the amount of
A.) protein. B.) thymine. C.) adenine. D.) cytosine.
Oxygen-poor blood from the body first enters the heart in the ______.
a) right ventricle b) left ventricle c) right atrium d) left atrium e) coronary vein