AP BIOLOGY

Detailed explanation-1: -Living things are formed from carbon-containing molecules, so the carbon cycle is the only biogeochemical cycle that really affects humans. Some plants have bacteria living in nodules on their roots that “ fix” atmospheric nitrogen, converting it to a form of nitrogen the plant can use.

Detailed explanation-2: -The carbon cycle is one of several key biogeochemical cycles linking the biosphere, atmosphere, geosphere, and hydrosphere.

Detailed explanation-3: -Human activities have a tremendous impact on the carbon cycle. Burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere.

Detailed explanation-4: -Human activities have greatly increased carbon dioxide levels in the atmosphere and nitrogen levels in the biosphere. Altered biogeochemical cycles combined with climate change increase the vulnerability of biodiversity, food security, human health, and water quality to a changing climate.

Detailed explanation-5: -They are vital as they recycle elements and store them too, and regulate the vital elements through the physical facets. These cycles depict the association between living and non-living things in the ecosystems and enable the continuous survival of ecosystems.