Which hormones are primary endocrine products of the ovaries?
A. estrogen and follicle-stimulating hormone
B. follicle-stimulating hormone and testosterone
C. progesterone and testosterone
D. estrogen and progesterone
D. estrogen and progesterone
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Escherichia coli living in the human colon can be considered to be a(n):
A) endosymbiont. B) opportunist. C) symbiont in a mutualistic relationship. D) all of the above
By how many people does the global human population increase each day?
A) 1000 B) 12,500 C) 250,000 D) 2,500,000
The sperm produced by mosses require _____ to reach an archegonium.
a) animals b) light c) the development of a flower d) wind e) moisture
Colors are more difficult to see at low light levels because
A. rods require high light levels to function. B. there is no color to light when it is at low light levels. C. cones do not function at low light levels. D. cones do not respond to different wavelengths of light.