I wonder what common mechanism in genes creates food chains and pedators. All through time, it seems to appear over and over as a survival tactic. But it sounds counterintuitive. Food chains sustain life. And create monsters.

Actually, the mitochondria in your cells that provides ATP power is something we ate a long long long long time ago.

So, it predates the dinosaurs.

@1: Living organisms aggregate nutrients, collecting and/or synthesizing them. There's always going to be a niche for something that, instead of gathering the nutrients itself, goes after the energy-rich cells or tissues of other organisms.

@2: Mitochondria also predate the divergence of unikonts and bikonts. In fact, the original endosymbiosis event seems to have come about around when eukaryotes were first emerging.
Why the fuck are you bringing up mitochondria? (Also, "mitochondria" is plural; the singular is "mitochondrion".)