All types of internal fertilization require
A. specialized anatomical structures.
B. transfer of a spermatophore to the female reproductive tract.
C. a terrestrial environment.
D. a penis in the male.
Answer: A
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Which of the following is considered a cardinal growth temperature?
A. The minimum temperature B. The optimum temperature C. The maximum temperature D. All of these are considered cardinal growth temperatures.
Why is antigenic drift a problem for the immune system?
A. It requires a new, primary response by B cells. B. The ability of MHC to present antigen is affected. C. T cell receptors may not recognize the altered antigen. D. Two answer options are correct: It requires a new, primary response by B cells AND T cells may not recognize the altered antigen.
In places where deposits of diatom shells have been lifted onto land by geological processes, people mine the resulting "diatomaceous earth.". Why?
What will be an ideal response?
When did the Earth's crust form?
a. 2.9 billion years ago b. 3.2 billion years ago c. 4,600 million years ago d. 4.6 thousand years ago e. 12,000 years ago