What type of blood vessel is solely responsible for exchange between the blood and the interstitial fluid?
A) artery
B) arteriole
C) capillary
D) venule
Answer: C
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The differences in evolutionary rates of change revealed by relative rate tests may be attributable to
A) differential strength of selection. B) generation time. C) average DNA repair efficiency. D) differential exposure to mutagens. E) All of these
The original source of genetic variation that serves as the raw material for natural selection is ________
A) mutation B) gene flow C) geographic isolation D) random fertilization
The ________ generation of a plant is diploid
Fill in the blank(s) with correct word
Countercurrent exchange is evident in
A) the flow of water across the gills of a fish and that of blood within those gills. B) the flow of blood in the dorsal vessel of an insect and that of air within its tracheae. C) the flow of air within the primary bronchi of a human and that of blood within the pulmonary veins. D) the flow of water across the skin of a frog and that of blood within the ventricle of its heart. E) the flow of fluid out of the arterial end of a capillary and that of fluid back into the venous end of the same capillary.