Which of the following cannot be determined from the fossil record?

A. diversity has changed through time
B. evidence of every species that ever existed
C. Evidence of prior natural disaster / catastrophes exist
D. Geologic uplift has occurred
E. Transitional fossils exist


Ans: B. evidence of every species that ever existed

Biology & Microbiology

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In B cell selection and tolerance, if no signal is generated from ________ cells, the B cells remain unresponsive

A) TC B) TH C) B7 D) CD28

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Indicate whether the statement is true or false.

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A mutation in a promoter region that causes the promoter sequence to more closely resemble the consensus sequence is called an up promoter mutation and results in a decrease in transcription

Indicate whether the statement is true or false

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The skin and oral cavity may have anaerobic microenvironments

Indicate whether this statement is true or false.

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