its called the Circle Of Life
Another answer:
You might be trying to think of: The Food Web
a food web or food chain
Venn Diagram
Venn Diagram
Phylogenetic tree
A food web is a diagram that shows the feeding relationships among organisms in an ecosystem. It consists of interconnected food chains that illustrate how energy and nutrients flow through the ecosystem via predator-prey interactions. The food web highlights the complex and dynamic nature of ecological relationships in a given habitat.
A branching tree diagram shows prbable evolutionary relationships among organisms
food web
Its a food chain, a food web is a more complex model of feeding relationships.
gene map
I don't think it's a graph..
Food web
Food web