As mattnewport mentioned above our ancestors evolved to live on fruits. Most animals can synthesis their own vitamin C. We only lost that ability because our ancestors had so much of it in their diet that they didn’t need to synthesize it.
If fruits didn’t contain vitamin C, we wouldn’t have lost the ability to synthesize it, possibly losing the ability to synthesize something else that they did have.
As mattnewport mentioned above our ancestors evolved to live on fruits. Most animals can synthesis their own vitamin C. We only lost that ability because our ancestors had so much of it in their diet that they didn’t need to synthesize it.
If fruits didn’t contain vitamin C, we wouldn’t have lost the ability to synthesize it, possibly losing the ability to synthesize something else that they did have.