How does climate change affect earth's oceans?
A. The pH level of the ocean will shift to a more basic environment, leading to a decrease in overall productivity.
B. As levels of carbon in the atmosphere increase, the amount of carbon in the ocean decreases proportionately.
C. The pH level of the ocean will shift to a more acidic environment, leading to stress and the possible extinction of many species of shellfish and corals.
D. Excess carbon in the atmosphere is absorbed by the ocean, which directly increases ocean temperature.
Answer: C
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If a single gene has 3 or more alternative forms, this is called
A. pleiotropy. B. multiple alleles. C. epistasis. D. blending inheritance. E. codominance.
For maximum effect, one should
a. perform strength training only. b. perform aerobic exercise only. c. perform both aerobic exercises and strength training. d. perform much strength training and only a little aerobic exercise. e. perform much aerobic exercise and only a little strength training.
Cells obtained from a Triplo-X woman would contain ________ Barr bodies
A) 0 B) 1 C) 2 D) 3 E) 4
The end result of the process in Figure 20-1 is:
a. sympatric speciation.
b. allopolyploidy.
c. hybridization.
d. rapid speciation.
e. All responses apply