If pregnancy does not occur, then
A. chorionic gonadotropin levels increase.
B. progesterone levels decrease and estrogen levels increase.
C. both progesterone and estradiol levels increase.
D. LH and FSH levels decrease.
E. both progesterone and estradiol levels decrease.
E. both progesterone and estradiol levels decrease.
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Further evolution of the protostomes changed the coelom by
(a) losing it. (b) reducing it. (c) it becoming a pseudocoel. (d) all of the above.
Humans convert approximately ________ of the energy stored in food to useful work
A) 22% B) 34% C) 55% D) 99.9%
Molecules with a molecular mass less than 5000 daltons can become antigens when they bind to carrier molecules
Indicate whether the statement is true or false
In early cell evolution, why would natural selection favor division into equal-sized daughter cells?
a. Splitting into two equal parts is the most energetically efficient method. b. Two daughter cells is the most efficient way to reproduce sexually. c. Splitting into two daughter cells is more efficient for horizontal gene transfer. d. Hypercycles can be maintained by splitting into two.