Sperm pass through all of the following structures en route to the egg, except:
A. the ovaries.
B. the uterus.
C. the cervix.
D. the vagina.
E. the fallopian tubes.
A
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Twin, adoption, and family studies show that obesity has a heritability that averages close to ____
a. 0.1 b. 0.3 c. 0.5 d. 0.7 e. 0.9
Which statement about seedless vascular plants is true?
a. Seedless vascular plants tend to thrive in moist environments. b. Liverworts and horsetails are seedless vascular plants. c. Ferns are the earliest group of seedless vascular plants. d. Seedless vascular plants absorb nutrients through exposed surfaces.
A significant event influencing the rapid
evolution of plants on land after their initial appearance was the a. increase of atmospheric oxygen. b. reduction of ultraviolet radiation penetration through the atmosphere. c. stabilization of global climates. d. increase in soil nutrients. e. merging of land masses
Expression of a shortened skin keratin gene in place of the normal keratin gene in transgenic mice resulted in a phenotype in which mice had
a. thick skin. b. no hair. c. fragile, easily blistered skin. d. white hair. e. Both b and c