In the ocean, many individual food chains overlap and intersect to form complex food webs . Most marine creatures eat a variety of foods. This flexibility allows them to switch if one link in the chain is depleted. Food webs usually end with a top predator on which nothing else preys. But, all living things die.
Animals eat the dead organisms, and then bacteria and fungi attack and decompose the remains.
Currents may carry the nutrients back to the surface where phytoplankton use them in photosynthesis . Organize your class into a circle. Discuss why the food web begins with the sun. The students decide which organisms depend on the sun. Then pass the yarn from herbivores back and forth to the producers.