The fossil record shows that for many plant and animal groups, the time between speciation events
A) is usually about 50,000 years.
B) varies greatly, but averages 6.5 million years.
C) is usually greater than 40 million years.
D) is equivalent to the length of 100 generations of a species.
Answer: B
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Which of the following is not a cause of increased levels of greenhouse gases?
A. All of the answer options are correct. B. burning of fossil fuels C. increasing cattle populations D. expansion of rice paddies E. thawing of the permafrost in the tundra
Describe the four premises of Darwin's theory of evolution by natural selection
What will be an ideal response?
During the repolarization phase of an action potential, the membrane potential falls from +60 to -70 mV. This drop is due mostly to the movement of ________ ions
A) chloride B) potassium C) sodium D) calcium E) hydrogen
The principle of ________ favors the hypothesis that requires the fewest assumptions.
Fill in the blank(s) with the appropriate word(s).