Write down three adaptations humans have to have differential survivability

Humans have the thickest skin one the soles of feet(so we can not hurt our feet every time we take a step
we have eyelashes to keep dust and other particles out of our eyes
people in colder regions tend to have narrower eyes and nostrils to make sure heat isn't lost

It should be cryosphere and hydrosphere

If the experiment was perfomed more then once and you get the same results