The proportion of the air we breathe accounted for by oxygen is approximately
A. 21%.
B. 1%.
C. 5%.
D. 50%.
E. 78%.
A. 21%.
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The rate of oral cancer has risen steadily since 1973, and many health experts believe that this increase is related to the transmission of:
a..HIV. b..HPV. c..HSV-2. d..HSV-1.
Hairs on the leaf on the yellow bush lupine act to ________
a. deter herbivores b. shelter nitrogen-fixing bacteria c. trap moisture d. feed ants that defend the plant
The AT3 protein that Harry Meade was working with
a. is important to aid in clot formation. b. has never been cloned. c. can prevent blood clots from forming. d. is found only in sheep. e. is produced in the salivary glands.
The response to selection, R, is equal to
A) the heritability (h2) of a trait. B) the strength (S) of selection. C) the difference between h2 and S. D) S/h2. E) h2S.