Why are many of the industrialized agriculture techniques popularized during the Green Revolution not sustainable?
A. They depend on fossil fuels, which cannot be replaced and whose use
harms the environment.
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B. They depend on labor performed by humans and by animals whose
populations are in decline.
C. They make planting and harvesting more efficient, which allows farmers to
feed growing populations.
D. They involve genetically modified organisms, whose full environmental
impact is unknown.

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.