ap bio essay 1 - 3 Describe the biochemical cycles of...

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3. Describe the biochemical cycles of carbon and nitrogen. Trace these elements from the point of their release from a decaying animal to their incorporation into a living animal. A biogeochemical cycle is any of the various nutrient circuits, which involve both biotic and abiotic components of ecosystems. The biological importance of the carbon cycle is that carbon forms the framework for the organic molecules essential to all organisms. Photosynthetic organisms utilize CO during photosynthesis and convert the carbon to organic forms. The forms are used by consumers, including heterotrophic prokaryotes. The major reservoirs of carbon include fossil fuels, soils, the sediments of aquatic ecosystems, and the atmosphere. The largest reservoir is sedimentary rocks such as limestone. As shown in Diagram 1, photosynthesis by plants and phytoplankton removes substantial amounts of atmospheric CO every year. This quantity is approximately equaled by CO
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