Quote Originally Posted by bobh View Post
There's this thing called "the food chain".

We all get energy from the sun.
Plants convert solar energy by photo synthesis.

plant eaters piggyback this process.
Meat-eaters piggybackack the plant-eaters method and so on.
The plant eaters are easy prey because thy haven't eaten enough protein for their brains to develop enough to evade the predators..

QED
Yes, animals we eat get their protein from plants. Good answer.