Re: Why do we eat what we eat?
Oddly enough I had a similar thought, and came up with a crazy hypothesis. Once upon a time (namely primordial Earth), a natural localised disaster cut off an area of plankton/early life/whatever from it's natural energy source (the Sun). Slowly, as available energy ran out, some of the early life did the only reasonable thing and started 'eating' the other life forms that were dead from starvation, and slowly started eating even forms that were still alive. Considering that there was no mechanism to defend against being eaten (yet), these new early predators spread and started eating other life forms that had already done the hard work in harvesting the sun's energy.
Yes, that does mean that my hypothesis is stating that all herbivores and carnivores evolved from single cell cannibals
Feel free to dismiss the idea
It doesn't need to be that complicated. If a single cell with chlorophyll can convert light to matter then that is all you need. Cells die, something evolves to use that dead matter to feed on. Voilą you have a food chain.
They couldn't hit an elephant at this distance.