What is an ecological impact of growing the same crop, year after year, on the same plot of land?
a) drought
eliminate
b) soil erosion
c) nutrient depletion
d) increase in soil fertility

Biomass can be used to generate electricity. biomass relies heavily on agricultural crops. plants release carbon dioxide and water in combustion. plants use photosynthesis to originally generate the energy that is needed. the chemical energy of these plants all started with what energy source?

How much time has elapsed from the very beginning of "the memior of the conquistador bernal diaz del castillo" to the end? a. castillo's whole life b. a quarter of an hour c. a few weeks d. a decade

What are the characteristics of subsystem