In humans, spermatogenesis differs from oogenesis in that
a. spermatogenesis involves meiosis, while oogenesis involves mitosis.
b. spermatogenesis begins at birth, while oogenesis begins at puberty.
c. spermatogenesis has unequal cytoplasmic divisions, while oogenesis does not.
d. spermatogenesis produces fewer numbers of gametes.
e. spermatogenesis continues throughout a male's life, while oogenesis ends at menopause.
E
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After Darwin concluded his voyage on the Beagle, he proposed that the process of natural selection was a mechanism for:
A. overpopulation of finches on the Galapagos Islands. B. speciation. C. artificial selection. D. sexual selection. E. evolution.
Select the vitamin that is matched to an incorrect deficiency symptom or disorder.
A. vitamin B1—beriberi B. vitamin D—pernicious anemia C. vitamin A—night blindness D. vitamin K—severe bleeding E. vitamin B2—inflammation and breakdown of skin F. vitamin C—scurvy
Which statement about the geologic time scale is false?
a. Mammals originated early in the Mesozoic era. b. Radiations of marine invertebrates took place in the Mesozoic era. c. Mass extinction of the dinosaurs occurred about 65 million years ago. d. Reptiles originated during the Paleozoic era. e. Eukaryotes originated during the Proterozoic eon.
____ is the study of body plans and structures
among groups of organisms. a. Embryology b. Molecular archeology c. Evolution d. Comparative morphology e. Composition