its called the Circle Of Life
Another answer:
You might be trying to think of: The Food Web
Food Web / Food Chain
a food web or food chain
Venn Diagram
Venn Diagram
Phylogenetic tree
Its a food chain, a food web is a more complex model of feeding relationships.
A branching tree diagram shows prbable evolutionary relationships among organisms
I don't think it's a graph..
gene map
food web
energy pyramids
Food web
food web