Which of the following would be an example of sexual selection? 

A. a sex ratio of 5 females to 1 male
B. females avoid aggressive males
C. male deer with poor eyesight are more often killed by accidents
D. well-nourished females produce more offspring


B. females avoid aggressive males

Biology & Microbiology

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Hematocrit approximately makes up what percent of the total blood volume?

a. 10 percent b. 25 percent c. 45 percent d. 50 percent e. 70 percent

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Which of the following phyla is a deuterostome?

a. annelids b. molluscs c. flatworms d. arthropods e. echinoderms

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The boreal forest biome does not contain deciduous trees. Indicate whether the statement is true or false

Biology & Microbiology

Transposons may or may not leave a copy behind at the original site, whereas retrotransposons always leave a copy behind at the original site.

a. true b. false

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