Land tetrapods evolved just prior to which

mass extinction?



a. Cretaceous
b. Devonian
c. Ordovician
d. Permian
e. Triassic


B

Biology & Microbiology

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The central nervous system is most sensitive to

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What will be an ideal response?

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What are the possible solutions to the problem of replicating the ends of linear prokaryotic DNA molecules?

What will be an ideal response?

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Cells that have an extra 21st chromosome are

A) tetrasomic. B) triploid. C) haploid. D) trisomic.

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