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
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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
Which of the following phyla is a deuterostome?
a. annelids b. molluscs c. flatworms d. arthropods e. echinoderms
The boreal forest biome does not contain deciduous trees. Indicate whether the statement is true or false
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