SHORT TERM
The environmental stress, heat can have a short term affect by feeling hot all over and sweating when one feels hot. It tells us our body is over heated and reacts by sweating. We can sweat from being in the sun or exercising, just to name a few ways. When we do not sweat, our body is saying we are not hot. When air temperature, one can feel uncomfortable and try anything to make the feeling of being "hot", go away. When under heat, like the sun or even when exercising, we tend to feel weak, because our body is not used to this kind of high body temperature.
FACULTATIVE
One example of facultative adaptation is vasodilation. It opens the capillaries and then becomes closer to the skin. Basically the blood vessels get bigger. When you work out a lot, you are more prone to getting big mussels but veins pop out and its saying your body is in overdrive and sweat a lot and your are extremely hot.
DEVELOPMENTAL
A developmental adaptation to the heat is an example that skinnier people are prone to the heat and usually live in areas where there is heat, where as a large sized person is better off in the cold, due to the body mass of the larger person. This can be evidence from Bergmann's Rule.
CULTURAL
A cultural adaptation to heat can be clothes. When it is hot outside, most people tend to wear shorts and a loose t-shirt or tank shirt with sandals. We do not want to be covered up with jackets otherwise we are even hotter, so we tend to like to wear loose and comfortable short clothes so we do not feel as hot when we wear jeans or jackets. We even wear hats. When the temperature is usually over 80 or 90 degrees we rather wear clothing that shows more skin, so a small breeze can come through and we are less hot, that is why people wear bathing suits in the beach, so they can swim and be comfortable in more open clothes.
Some benefits of studying human variation through environmental stresses can teach us to not judge someone by the way they look, they can be a certain way because of the environment. Racism can be prevented if we seek to judge based on their character not on appearances. We also get the chance to prevent racism but learning some reasons why people are different. We can use this information to teach younger generations why people are the way they are and see how people before us dealt with the stresses from the environment. This information is very good because we can always look back at this and understand the differential variation.
To understand race through heat, we can make an assumption that the color of your skin can be determined by how much sunlight you get, saying the darker skin color you are, the more you are outside under the heat of the sun. That can be a reason on race and their skin tone, i do not agree with that. I believe a person is a certain race because of where they were from and what was around them that made them who they are. To better understand the human variation we can learn about where they came from and the culture they were put in with their surroundings and what they did to survive. The adaptations can show how one must have lived through, like we do now and know we share the same things as our ancestors. We can even stop racism, by showing people what people went through.