When most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that ________.
A. microevolution no longer occurs
B. artificial selection becomes a greater factor in microevolution
C. gene flow between populations is reduced
D. the founder effect becomes increasingly important
C. gene flow between populations is reduced
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Which hormone is responsible for increasing blood calcium levels?
a. insulin b. glucagon c. parathyroid hormone d. calcitonin
For each acetyl CoA molecule that enters the citric acid cycle, two CO2 molecules are produced
__________________ Indicate whether the statement is true or false.
The type of chemical bond that holds OH- and H+ together is
A. ionic. B. covalent. C. hydrogen. D. All the choices are correct.
Which of the following associations of bone structures and functions is NOT correct?
A. osteons - tubular units of compact bone B. osteoblasts - cells that build bone tissue C. lacunae - tiny chambers in concentric circles around a central canal D. red bone marrow - fat-storage tissue E. osteoclasts - cells that break down bone tissue