The highlighted structures innervate which of the following?
a) deep muscles of back
b) deep muscles of thorax
c) superficial muscles of back
d) superficial muscles of neck

What adaptation is apparent in the bodies of the three tortoise species shown in figure 16-2

Next pretest: evolution select the correct answer in a laboratory population of flies, the female flies are gray and the males are yellowish gray. biologists observed that all the male flies had an equal chance for reproduction, but the male flies with the brightest colors were more likely to successfully reproduce. what phenomenon could explain such a change? a sexual selection b. disruptive selection c. stabilizing selection d. directional selection

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time