The cross section in Figure 31-6 is representative of the internal structures found in:
A. phoronids.
B. nemerteans.
C. Diplopoda.
D. Polyplacophora.
E. oligochaetes
E
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The side toes of a horse, the pelvis of the whale, and the human appendix are all examples of structures that resemble structures of presumed ancestors, which are known as
A. analogous structures. B. homologous structures. C. vestigial structures. D. homeotic mutations. E. acquired structures.
Which group has the highest concentration of urea in their body fluids?
A. cartilaginous fishes B. marine bony fishes C. birds D. freshwater bony fishes E. reptiles
An atom has 19 protons, 19 electrons, and 20 neutrons; what is its atomic mass number?
A) 19 B) 20 C) 38 D) 39 E) 58
A physician has a young man as a patient who does not seem to be developing male secondary sex characteristics. Predict which hormone the physician could prescribe to help this issue.
A. estradiol B. testosterone C. progesterone D. cortisol E. growth hormone