Which combination makes the most sense from an evolutionary perspective?
a. light skin and vitamin D deficiency
b. light skin and extensive exposure to sun
c. dark skin and little exposure to sun
d. dark skin and folate deficiency
e. light skin and little sun, or dark skin and lots of sun
ANSWER: e
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Solution A has a pH of 6 and solution B has a pH of 8. Therefore, ____
a. A has 10 times greater H+ concentration than B. b. B has 10 times greater H+ concentration than A. c. A has 100 times greater H+ concentration than B. d. B has 100 times greater H+ concentration than A. e. A has 1,000 times greater H+ concentration than B.
The letter "C" in the above figure represents
which teeth? a. incisors b. molars c. canines d. premolars e. none of these
Progression through the various phases of the cell cycle depends on fluctuating concentrations of specific proteins called ________
Fill in the blank(s) with correct word
Of all of the chordate groups, why are there only two amniote groups (reptilia and mammalia)?
A) Amniotes are the only chordate group that has successfully survived the transition to land. B) The other craniate groups had brains that were not developed enough to allow the organisms to develop tool-building survival skills. C) The vertebral columns of the other vertebrates were not strong enough to survive the transition to land. D) The other jawed vertebrates were not able to obtain enough food to survive the transition to land.