The oval, three-layered sheet produced by gastrulation is called the
A) embryo.
B) ectoderm.
C) inner cell mass.
D) embryonic disc.
E) yolk sac.
Answer: D
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In resting individuals, energy use is proportional to
A) amount of lipids in the diet. B) carbon dioxide produced during cellular respiration. C) total caloric intake. D) weight. E) oxygen consumption.
Which gender of rodent should be taken to the cage for breeding?
a. male b. female
The bicuspid, or mitral, valve is located
A) in the opening of the aorta. B) in the opening of the pulmonary trunk. C) where the venae cavae join the right atrium. D) between the right atrium and right ventricle. E) between the left atrium and left ventricle.
The embryonic membrane that completely encloses the embryo in a watery sac is the
A. yolk sac. B. amnion. C. allantois. D. chorion. E. ectodermal sac.