La Rinconada. Altitude/elevation: 16,732’. It is located in Peru
Answer: Cloud at medium altitudes are:
A: They are made of ice crystals.
Explanation: Mid level cloud forms ice crystals when the temperature is cold.
human evolution started in (what ever area Africa was during Pangea) then threw what was connecting the continents (land bridge that connected Alaska from {don't quote I'm unsure cause I might have this backwards Antarctica} into what would become the Americas, to warmer climate.