When the head of the fetus presses on the cervix, it triggers a release of which hormone in the mother's body?
a. oxytocin
b. GnRH
c. progesterone
d. prolactin
a
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Many male songbirds are brightly colored. However, the color of the birds is determined by a balance of
A. natural selection against bright colors by predation and sexual selection in favor of bright colors. B. gene flow that reduces bright colors and natural selection in favor of bright colors. C. mutations that reduce bright colors and sexual selection in favor of bright colors. D. mutations that reduce bright colors and gene flow in favor of bright colors. E. natural selection against bright colors by predation and mutations that introduce bright colors.
By controlling their musculature, which of the following can vary the resistance to blood flow?
a. arteries b. veins c. capillaries d. arterioles e. venules
What is the difference between a first messenger and a second messenger? Give an example of each. What will be an ideal response?
A flowering plant produces pollen in the
A) anther. B) style. C) stigma. D) fruit. E) ovule.