Which of the following is a problem encountered by biologists who are attempting to estimate past extinction rates?
A) Species typically live for a very long time, and thus their extinction is not easy to document.
B) We have only currently identified about 2 million of the world's estimated 8 million to 100 million species.
C) Scientists know little about the nature and ecological roles of the species that have been identified.
D) All of these.
E) We have only currently identified about 2 million of the world's estimated 8 million to 100 million species and Scientists know little about the nature and ecological roles of the species that have been identified.
Correct Answer:
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A)
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Q12: The greatest threat to most species is
A)
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A)can create barriers that limit the
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