How many amino acids are considered to be
essential because the human body cannot
synthesize them?
a. 2
b. 5
c. 8
d. 10
e. 12
C
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The Keeling curve in Figure 25.1 shows that while CO2 levels oscillate on an annual basis, overall CO2 levels increase from year to year. Why has this trend continued in the last 50 years?
A. increasing rates of aerobic respiration associated with the rise in world population B. decreasing rates of oxygenic photosynthesis by plants and algae C. clearing of forests to create agricultural land outside the tropics D. combustion of fossil fuels
The role that an organism plays in its environment is called its
A. role. B. position. C. ecosystem. D. niche.
The sense with which amplitude and frequency are
detected with some accuracy is a. sight. b. hearing. c. balance. d. taste. e. smell.
The contractile vacuole of the paramecium is possibly an evolutionary precursor of the kidney.
a. true b. false