Food chains consist of producers and consumers what are producers?

Producers are the organisms at the "bottom" of the food chain, they are usually things like plants that are eaten by other organisms. Producers are called producers because the don't consume other organisms for energy they use some other means of acquiring energy, in the case of a plant this means of acquiring energy is photosynthesis.

Explanation:

the tricuspid valve is present between right atrium and right ventricle