The very earliest forms of life probably ________
A) required an external food supply
B) manufactured their own food supply by photosynthesis
C) manufactured their own food supply by chemosynthesis
D) were similar to present-day anaerobic bacteria
A
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We would expect that soil leaching would be most severe in regions where
A) there is little rainfall and no irrigation of crops. B) irrigation is applied to fields on hillsides. C) mollisols are abundant and farmers rarely plow. D) cattle are grazed and natural grasses cover the land.
The citric acid cycle includes which of the following?
A) the electron transport chain B) the oxidative phosphorylation pathway C) both a and b D) neither a nor b
Given an alkane, an alkene, and an alkyne, each of which contains two carbon atoms, which compound will contain the fewest hydrogen atoms?
A) the alkane B) the alkene C) the alkyne D) None, they all contain the same number of hydrogen atoms.
If current manufacturing, consumption, and energy use trends continue, an increase in global population with time will likely result in:
A lower GDP and lower environmental costs. The same GDP and environmental costs. A higher GDP and higher environmental costs. A higher GDP and lower environmental costs.