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
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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
Only high-risk individuals such as scientists working with the organism, livestock workers, and military personnel are vaccinated for anthrax
Indicate whether the statement is true or false.
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
The skin and oral cavity may have anaerobic microenvironments
Indicate whether this statement is true or false.