Did diet habits of early primates effect evolution in any way?
Being able to exploit soruces of food that are readily available is a key survival “tactic” and can be a mechanism for natural selection in any species.
Some common examples that have been postulated (hard to prove these things) are:
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Color vision in order to identify when fruits are ripe.
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Binocular vision to locate and capture prey.
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Ability to taste (and like) sweet things to favor ripe fruits.
But it can be a chicken/egg problem. Mutations happen without any particular regard to what they will allow an organism to do. So a better way to look at is: mutations allow the exploitation of new food sources (or better exploitation of existing sources) and evolution (natural selection) favors those individuals with mutations that give them better access to food (if it allows them to produce more offspring).
Also, don’t forget that many plants evolve in such a way that “helps” animals use their fruits for food. This sets up a feedback mechanism between the plant and the animal. Thus, fruit eaters evolve to favor sweet fruits, and plants evolve to produce sweeter fruit when it is ripe.
And if you look at some not-so-early primates, it is postulated that our early homind ancestors could not have supported an enlarged brain without the addition of animal protein/fat to our diet.