it has been scientifically proven that the material of which the Sun was formed from is also the source of the material the Earth formed from
and it is known that stellar objects in independent systems ALWAYS form before planetary objects
so what accounts for that discrepancy?
no, it's quite possible they saw a carnivore eating meat, and decided to reflect such behavior.
In addition, they may have learned to cook meat because a fire could have killed the animal and it ended up tasting better to them.