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How food chains and food webs represent the flow of energy and matter. Trophic levels and efficiency of energy transfer.
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Learn about food chains and food webs on Khan Academy.
The ways in which an element—or compound such as water—moves between its various living and nonliving forms and locations in the biosphere is called a biogeochemical cycle. Biogeochemical cycles important to living organisms include the water, carbon, nitrogen, phosphorus, and sulfur cycles.
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Because we get our energy from our food, a food chain also shows the flow of energy from one creature in the chain to another. So a food chain always has to start with a producer because they can harness the energy in sunlight to make food.
Key points. Phosphorus is an essential nutrient found in the macromolecules of humans and other organisms, including DNA. . . The phosphorus cycle is slow. Most phosphorus in nature exists in the form of phosphate ion— PO 4 3 −. .
Apply your understanding of food and energy in organisms in this set of free practice questions aligned to NGSS standards.