The people represented by the denisova fossils likely:

The people who represented the Denisovan species are more likely to be related to Neandertals, rather than human beings (Homo sapiens). The former differs from the latter at 202 positions of the mitochondrial DNA. Their fossil records claim that humans, Denisovans, and Neandertals have the same ancestry. 

The answer your looking for is a food chain grid. it describes how nature can support itself and survival of the fittest comes into play..