system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is the biological or psychological reason of screaming when we are afriad?
gpt
We developed as a tribal species, screaming is a way of communicating an imminent threat to the rest of the tribe. If we just stayed quiet while a predator killed us our species would've been wiped out because no one would even realize the predator was out there.