Since the Pleistocene ice age, deserts have been gradually forming in the southwestern United States

As the original lakes and rivers of this area shrank into isolated streams, ponds, and springs, the fishes living in them developed a strong potential for
A) temporal isolation.
B) speciation.
C) mechanical incompatibility.
D) hybridization.
E) hybrid inviability.


B

Biology & Microbiology

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Which tissue type will move the body? a. Muscle b. Nerve c. All of these choices

d. Epithelial e. Connective

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When oxygen is plentiful, cells can make about _____ molecules of ATP per glucose molecule. In the absence of oxygen, they can make ____ molecules of ATP

Fill in the blank(s) with the appropriate word(s).

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Which structure or compartment is not part of the plant's apoplast?

A) the lumen of a xylem vessel B) the lumen of a sieve tube C) the cell wall of a mesophyll cell D) the cell wall of a transfer cell E) the cell wall of a root hair

Biology & Microbiology

An active, non-fatiguing muscle would be expected to have

A. aerobic respiration B. moderate rates of contraction C. numerous mitochondria D. aerobic metabolism, numerous mitochondria, and moderate rates of contraction.

Biology & Microbiology