What is true of Pfiesteria?
A. It seems to flourish in the presence of certain pollutants.
B. It has been a menace to fish and humans for over 3000 years.
C. It is the oldest life form on earth.
D. In large concentrations, it poses a threat to fish but not to humans.
Giải bởi Vietjack
Đáp án A
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