A single ecosystem holds all the food chain and this is called a food web. Every living creature in the ecosystem is a component of multiplex food chains. Every food chain is a possible pathway that nutrients, and energy could take on while they travel throughout an ecosystem. Each and every one of the overlapping, and organized food chains in the same ecosystem create a food web. "A food web is a graphical description of feeding relationships among species in an ecological community, that is, of who eats whom"( J. Duffy, 2013 ). Trophic levels consist of a group of organisms in the food webs. Also, this trophic levels are divided into three levels and this levels are decomposers, consumers, and producers. The first trophic level is known as Producers. Also, they create their food and they don't turn to other organism, and they also called autotrophs. Normally autotrophs create food using a process known as photosynthesis, and that create a nutrient known as glucose, and these consist of water , carbon dioxide, and sunlight. There are different types of autotroph but plants are the most known type. One larger plant that's known as seaweed is a autotroph. Also, tiny organisms living in the deep-sea called Phytoplankton, are also autotrophs. There are various bacteria that are autotrophs. Example, in a lively volcanoes exist bacteria and they use sulfur to put together its own food. This procedure is known as chemosynthesis.

The following trophic levels consist of organism that consume producers. This animals or creatures are known as consumers. Main consumers are known to be herbivores. Herbivores consume plant life, seaweed, and others producers. Deer, cows, and even elephants are herbivores living in a ecosystem of grassland. They eat trees, shrubs, and grasses. A mouse that consume fruits and seeds in a ecosystem of a desert is known as prime consumer.