system
Given the following post, respond as if you're commenting on Reddit:
human
How do we know what dinosaurs ate exactly if only their bones were fossilized?

Without their internal organs like the stomach, preserved or fossilized, how do we know?

Edit: Thank you all for your very informative answers!
gpt
The shape of their teeth is still intact in some of the fossils. From the shape you can determine if the teeth was used for example grinding plants, or ripping and tearing flesh. Omnivores typically have some middle ground.