Which of the following is a common selective agent for natural selection? 

A. mutations
B. competition for food and other resources
C. sex ratio
D. population size


B. competition for food and other resources

Biology & Microbiology

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Which of the following is present when sperm penetration occurs?

Biology & Microbiology

True or False: Vertebrates may have an external skeletal system

A. true B. false

Biology & Microbiology

Which of the following is not a "natural" means of transferring DNA in prokaryotes?

A) conjugation B) electroporation C) transduction D) transformation E) infection

Biology & Microbiology

Epigenetics is most closely associated with

which of the following?

a. base-pair substitution b. metylation c. Barr bodies d. hydrolysis e. phosphorylation

Biology & Microbiology