Refer to Figure 31-5. In which class is this organism placed?
A. Cephalopoda
B. Gastropoda
C. Polyplacophora
D. Bivalvia
E. Chromodoris
D
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Approximately how many capillary beds contain flowing blood?
a. 85% b. 50% c. 1% d. 10%
In the absence of predators, what do you think was the main selection factor affecting the average number of spots on male guppies?
a. an infectious disease that influenced pigment deposition in guppy integument b. sexual selection by females for males with high spot numbers c. a completely random process d. none of the above
________ makes it possible to trace phylogenies among microbial groups for which there is no fossil record
A) Convergent evolution B) Using vertebrate outgroups C) Horizontal gene transfer D) Molecular systematics
Heart block is a condition in which the SA node is properly functioning but the atria and ventricles are contracting out of synch. Which of the following statements explains why this happens?
A) The SA node is working extra hard to make the ventricles catch up. B) The heart valves are allowing blood to flow backward through the heart. C) The AV node is not sending signals to the ventricles as it should. D) The coronary arteries are not delivering blood to the heart.