1.Heat is an environment stress that has a negatively impacts the survival of humans by disturbing homeostasis. The human body temperature for normal cellular function is approximately 98.6 degrees Fahrenheit. Heat has high UV light which can result a risk in skin damage. Heat can affect the body temperature and hydration level of an individual.
2.Perspiration is a short term adaptation that allows the human body to respond quickly to the heat in the environment to main homeostasis.
The facultative adaptation to heat conditions is vasodilation. The effect of this is flushing, which increased redness and warming of the skin.
A culture adaption can be wearing summer type clothes like tank tops and shorts. Another adaptions is having air conditioners in every house hold when it comes to the hot weather.
3.Understanding evolution and genetic mutation are benefits of studying human variation from this perspective across environmental clines. This information can be explored to understand different skin color, diets, behaviors, or any physical appearance.
4. To understand human variation you need to understand the study of environmental stress around them. People around the world are expose to different amount of UV radiation for vitamin D synthesis, which influence their skin color.Race cannot be use to understand the variation of the adaptations.
