They made clothes when the temperatures got cold, sometimes when it became cold enough prehistoric people were known to kill animals and use their carcasses to keep warm, and they also made fire for the first time-- thus scaring away predators and keeping their healthy body temperatures.
Neurologists, Psychiatrists, or Neurosurgeons.
"The best way to spread Christmas cheer is singing loud for all to hear."
I apologize if this is incorrect or unhelpful.
3) producers
4) decomposers
I think its what we think effects what we do
hope this helps ☺