Why is it illegal for employers to ask about your past medical history?

Confidentiality ; HIPAA

An employer may not ask about your medical history due to HIPAA also known as confidentiality 

The climates of a place can and do effect it, animals, and people. A hot environment can dry up the environment. The humidity and temperature of the place can rise and harm both animals and humans that can die of overheating etc. although, some environments were made for such conditions. Deserts have plants and animals that have adapted to the heat. A much colder environment can have extremely low temperatures, and snow. Animals within those places have coats/fur to keep them warm. Most sleep all winter. Plants adapt to the weather and bloom during curtain times of the year. Humans need heat to keep thier blood warm.!