system
Given the following post, respond as if you're commenting on Reddit:
human
If I could travel back to the time of the velociraptor. Would the atmosphere composition and temperature on Earth kill me before the velociraptor did?
gpt
I think you'd be fine, until you tried to light a cigarette and burned your face off. The atmosphere was nitrogen, oxygen argon, CO2, like now, warm and humid, you'd not be in danger of oxygen toxicity, pO2 would be at most 0.35. In fact, the extra O2 would probably feel great.