__________ regulates the maturation of the mammary glands, and then _____ causes contraction of milk glands.
Fill in the blank(s) with the appropriate word(s).
Prolactin; oxytocin
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The drug level required for the clinical treatment of a particular infection is called the
A. therapeutic index. B. minimal inhibitory concentration. C. therapeutic dose. D. toxic dose.
Ovulation typically occurs on day ____ of a 28-day ovarian cycle
a. 1 b. 7 c. 10 d. 14 e. 28
Many male birds will expend a great deal of
energy building nests. Females will mate with the males who build the best nests. This is best described as an example of
a. natural selection. b. sexual selection. c. runaway selection. d. the Red Queen effect. e. disruptive selection
The front limbs of birds and bats -- both wings -- are considered to be:
a. homologous structures. b. homozygous structures. c. divergent structures. d. vestigial structures. e. homoplastic structures.