Five hundred forty-one people per thousand die of this disease. This is a statement about
A. an extrinsic limiting factor.
B. environmental resistance.
C. mortality.
D. All of these answers are correct.
D. All of these answers are correct.
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Because the shared electrons between hydrogen and oxygen spend more time orbiting the oxygen than the hydrogen, water is
a. a charged molecule. b. a neutral molecule. c. a nonpolar molecule. d. ionized. e. a polar molecule.
Enzymes used to cut genes in recombinant DNA research are known as ____
a. ligases b. restriction enzymes c. transcriptases d. DNA polymerases e. replicases
The human ancestor whose populations dispersed from Africa to other parts of the world was
a. Homo sapiens b. Australopithecus afarensis. c. Pan troglodytes. d. Homo erectus.
Almost 70 percent of women with breast cancer are estrogen-senstive. What does this mean?
A. They are made ill with prescriptions of estrogen. B. Only a small amount of estrogen can exacerbate their symptoms. C. Their own natural estrogen encourages the growth of cancer cells. D. Their cancers go into remission with increased uptake of estrogen. E. They do not produce their own estrogen.