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    Exam 21: Reconstructing and Using Phylogenies
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    Biologists Estimate That There Are Tens of Millions of Species
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Biologists Estimate That There Are Tens of Millions of Species

Question 58

Question 58

Multiple Choice

Biologists estimate that there are tens of millions of species on Earth.How many have been described?


A) 18,000
B) 90,000
C) 180,000
D) 1.8 million
E) 9 million

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