A. 10
B. 20
C. 50
D. 100
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The correct answer to the question: "Zoologists have described approximately _________species of pterobranchs?" is "20".
A. 10
B. 20
C. 50
D. 100
The correct answer to the question: "Zoologists have described approximately _________species of pterobranchs?" is "20".
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