Which of the following is most likely the cause of

the current extinction crisis?
a. asteroid impact
b. human activity
c. adaptive radiation
d. tectonic activity
e. climate change


Answer: b

Biology & Microbiology

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Patients with Creutzfeldt-Jacob disease live ________ post diagnosis.

A. 10 to 20 years B. greater than 25 years C. 5 to 10 years D. less than 1 year E. 1 to 5 years

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Discuss the major trends in hominid evolution

What will be an ideal response?

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Saliva contains salivary __________ an enzyme that begins the chemical digestion of starch.

Fill in the blank(s) with the appropriate word(s).

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Likelihood is preferable to parsimony to infer a phylogeny when

A. there is a great deal of homoplasy. B. a researcher wishes to incorporate different models of molecular evolution into phylogenetic estimates. C. evolutionary rates vary greatly among the taxa of interest. D. a researcher wishes to include a measure of confidence in the nodes of the phylogeny. E. All of the above

Biology & Microbiology