Gen 1:29 ESV – And God said, “Behold, I have given you every plant yielding seed that is on the face of all the earth, and every tree with seed in its fruit. You shall have them for food.
Gen 1:30 ESV – And to every beast of the earth and to every bird of the heavens and to everything that creeps on the earth, everything that has the breath of life, I have given every green plant for food.” And it was so.
This single verse is so direct and simple its almost to direct. The original creation of Yahweh was totally 100% plant based. Including every animal except apparently fish. Fish have the breath of life in it I would think, but oddly they aren’t mentioned directly.
If we assume at least all land and air based life is herbivorous, then the normative experience of life would be staggeringly different than today just from this one simple idea.
There would be no death at the hands of anything else.
There is no predation in any form. From any creature. The interaction between species and creation would be uninhibited. Later in scripture we see that Animals would fear mankind, which would be something new.
There is no dominance of pathogenic life. What we understand as pathogenic now is simply out of balance relationships of macrobiotic life at the very leas.t Potentially, there were no real pathogens at all.
There is an implication that the growing things are for food (only with seeds in it), and there is plenty provided by Yahweh. Mankind is to have dominion over the animals, but we don’t see what relationship mankind has to vegetation except to eat it.
While some modern day animals are omnivorous or carnivorous, this can only be interpreted in context of something being out of order with original creation. It isn’t what Yahweh created originally, and it isn’t what was intended. Later we will see a subsequent degradation of life, both in experience and duration which appears to connected to different factors, including this one.