Contraction of the right ventricle forces blood initially into the
What will be an ideal response?
pulmonary artery
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The addition of methyl groups to DNA by chemicals in tobacco can cause DNA to _____
a. replicate b. polymerize c. hybridize d. mutate e. fragment
Globally, cigarette smoking kills four million people
annually. That number is expected to increase to _____ million by 2030. a. 10 b. 50 c. 100 d. 150 e. 250
In cases of __________ growth, a population’s
growth is proportional to its size. Fill in the blank(s) with the appropriate word(s).
How does ocean fishing affect marine ecosystems today?
A. Because the oceans are so large, they are the one remaining natural ecosystem that is not susceptible to extinction. B. Ocean fishing has resulted in overexploitation in 11 of the 15 major oceanic fishing areas. C. Only 2 of the 15 major oceanic fishing areas are considered overexploited. D. There has been an increase of bottom-dwelling ocean fish, but schools of swimming fish have declined. E. Bottom-dwelling fish are frequently overfished by trawling, but schools of swimming fish that can easily get away are increasing.