Evolution of dog food, Man

Did man learn to cook food to survive ?

Some anthropologists tell us that prehistoric humans were meat eaters, while others tell us that they were primarily gatherers of plants.

If humans were meat eaters, why don't you have large pointy teeth like other meat eaters such as a tiger? Or a lower jaw that juts out to catch prey like an alligator ?

Humans have a flat lower jaw that couldn't possibly grab a prey for the first bite.

If prehistoric man ate primarily plants, then why don't we have a multi-chambered stomach with stones so we can eat grass like a cow? Why don't we have 40 feet of intestines like a rabbit does to have more space to break down the fibre in plants? And why do we have small teeth that aren't able to grind grass like a horse's teeth?

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