Why do vegans say humans are herbivores?

If we're herbivores how do we get b12? B12 is not found in plants. And why do we have stomach acid that secrets protease?

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bijouxbroussard · F

[b]They[/b] are herbivores by choice. But if humans weren’t omnivores, would we have the means to chew and digest both meat and plants ? Do other animals who [b]are[/b] strictly herbivores ?