Movement of food through the digestive tract results from the action of _____
Fill in the blank(s) with the appropriate word(s).
smooth muscle
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Why is genetic variation important in helping a species survive?
a) the more varied a population, the less likely the environment is to change b) if the environment changes, some members of the species will probably have adaptations that enable them to survive and reproduce c) if the environment stays the same, a species with genetic variety will probably evolve rapidly d) disease rarely affects a population that has a lot of genetic variety
Figure 42.11
Use the figure above showing human embryonic developmental day 14 to answer the following question.
The structure that later becomes part of the placenta is indicated by ____.
A. A B. B C. C D. D E. E
The liver functions to
a. produce bile. b. pump blood. c. form urea. d. do both a and c.
The signal for aggregation and communal activity
by cellular slime molds is a. auxin. b. cyclic-AMP. c. glycoprotein slime. d. RNA. e. unidentified as yet.