Why were the first people covered with more hair than now since experts believe they were only about four and a half feet 1.4 meters tall with large jaws to grind food and were covered with long hair?

More winter frost - longer hair. This is a general law for the biOSphere. But there are some details:

1. Hair disappeared under closed clothes

2. Hair disappeared from Asian faces due to frozen breath, moisture and was replaced by subcutaneous fat.

3. The female body has lost more hair due to the large amount of subcutaneous fat needed for her unborn child.