What is the source of CO2 released into the atmosphere?
A. Volcanic activity
B. Anaerobic microbial activity
C. Respiration
D. Fuel combustion
E. All of the above.
Answer: E
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Which concept helps visualize resource use and the potential for interspecific competition in nature?
a. allopatric speciation b. the competitive exclusion principle c. sympatric speciation d. ecological niche e. resource partitioning
A basic truth of inheritance that had been known well before Darwin's time was that ____
a. offspring frequently resemble their parents b. offspring inherit genes from their parents c. selective breeding improves domesticated plants and animals d. offspring frequently resemble their parents and selective breeding improves domesticated plants and animals e. offspring frequently resemble their parents, offspring inherit genes from their parents, and selective breeding improves domesticated plants and animals
Why have so few primates gone extinct compared to other groups, for example, mussels or birds?
a. they have large brains b. they are not killed for food or other human uses c. they live in stable environments d. they are among the most closely monitored and protected species e. they are highly mobile
The carotenoid pigments of some phototrophs interact with ________ to reduce its toxicity.
A. singlet oxygen (1O2) B. hydroxyl radical (HO-) C. peroxide anion (O22-) D. superoxide radical (O2-) E. molecular oxygen (O2)