In an aquatic ecosystem, a secondary carnivore is temporarily excluded and then, after a period of time, is returned. Which one of the following is NOT an expected top-down effect after it is returned?
A. Algae decrease.
B. Primary carnivores become less abundant.
C. Primary productivity increases.
D. Herbivores become more abundant.
Answer: C
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Assume that a woman has a "normal" 28-day reproductive cycle. She is concerned about the times in which she may get pregnant. Her partner tells her that the only day she has to worry about in terms of getting pregnant is the day she ovulates
Explain to her why this is not the case.