Food chain and Food web

The food chain refers to a natural system by which energy is transmitted from one organism to another. When we refer to these systems on an ecological basis, we use the term food web.

A food chain refers to four main parts. These are:

* The sun – this is the primary source of energy for all organisms

* The producers – these are the plants. They are called producers because they are the only part of the food chain that produces their own food, as well as the food for other organisms. In fact, the oxygen that all living things breathe in __________ _____ ________ _________ ______ _____ ______.
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