Anthropogenic activities have increased the amount of biologically-active nitrogen in ecosystems by: O a, b, and c are correct O both b and c are correct a. burning fossil fuels c. using industrial processes to create nitrogen fertilizer by fixing atmospheric nitrogen O b. planting clover, soybeans, and other nitrogen-fixing crops
Nutrient Cycle
The chemical nutrients that are essential for the synthesis of living matter are taken from the physical environment. After the death and decomposition of living organisms, they are returned to the environment to be used over and again. This cyclic back and forth regenerative movement of chemical elements between organisms and their physical environment is known as the biogeochemical cycle or nutrient cycle. Since these elements serve as the essential chemical nutrients of organisms, their cyclic movements are also called nutrient cycling or mineral cycling. Minerals are not uniformly distributed all over the ecosystems but are more concentrated in specific compartments, called pools. The major biogeochemical cycles include the water cycle, nitrogen cycle, carbon cycle, phosphorus cycle, calcium cycle, sulfur cycle, etc.
Biosphere
The geologist Eduard Sues coined the term biosphere. The biosphere is characterized as a part of the earth, which includes ground and air. Moreover, the organisms on earth live in the biosphere. The biosphere is a confined area on the earth's surface where water, soil, and air combine to promote life. Several different types of life exist here.
Anthropogenic activities mean activities performed by human.
Human activities such as burning of fossil fuels releases many gases into environment.one such has is Nitrogen.
Use of more industrial and agricultural products which are nitrogen based which increase the level of nitrogen in soil
The nitrogen fixing crops such as soyabean or clover fix nitrogen into the soil as these are legumes. This fixation Is performed by bacteria like rhizobium which increase its concentration by about 3.5%
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