Sessile and sedentary reef dwellers include
a. sponges and cnidarians.
b. crustaceans.
c. many molluscs.
d. fish.
e. cephalopods.
A
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Cells save energy and materials by using many of the same enzymes for both ________ and ________.
What will be an ideal response?
The sodium-potassium pump of neurons pumps
A. Na+ and K+into the cell. B. Na+ and K+ out of the cell. C. Na+ into the cell and K+ out of the cell. D. Na+ out of the cell and K+into the cell. E. Na+ and K+into the cell and H+ out of the cell through an antiport mechanism.
Which of the following describes primary succession?
a. succession on land that previously had no life
b. succession that moves a community away from equilibrium
c. succession in response to a natural disturbance
d. succession characterized by equilibrium
What two main factors are responsible for the asymmetry in the coevolutionary arms race between microbial pathogens and their multicellular hosts?
What will be an ideal response?