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About how many species have been known and described so far?
A17 to 18 million
B1.7 to 1.8 million
C7 to 8 million
D170 to 180 thousand
Answer & Solution
Correct answer: B. 1.7 to 1.8 million
Biologists have described roughly 1.7 to 1.8 million species, and new ones keep being identified.
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