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Over time, climate can change within an environment very dramatically enough to change the overall traits of the environment. Because of this, humans over time were forced to think and problem solve as they would navigate the changing environments and adjust to them. Because of this, the more thinking and thought processing they do will strengthen the brain and therefore enlargen it because of the fact they use it more. More specifically, when they strengthen and enlargen the brain, they are specifically enlarging the neocortex of the brain which mainly takes care of the thought process.

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Every environment will have different climates of which can hold many kinds of diseases. Depending on where a human is living would over time strengthen their immune system as they are exposed to a disease native to the environment of which would train the immune systems to build resistance to the disease. This same trait can sometimes be passed down to the offspring to have them have the immune system (mind you not all the time).

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Humans would diverge to many environments that receive varying amounts of sunlight. Because of this, depending on what environment contains the most sunlight may affect the trait frequency of the human melanin production whereas if one environment contains a lot of sunlight, the skin would absorb it a lot causing high levels of melanin production which leads the skin pigment to darken. If an environment receives less sunlight, this would cause the melanin production to go at a normal or slower pace making the skin lighter. With this keeping in mind that melanin also works to protect the human body from the harmful UV rays so if the melanin repeatedly protects the human, it will end up making more melanin.

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Food availability permits people to ingest different types of bacteria depending on the food we eat and how we filter out other germs. This has an impact on how we digest and dispose of our meals. Also, the more new foods are introduced to the microorganisms in your stomach, the more they will become prepared to take on new foods in the near future.

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“Encephalization, or the evolutionary enlargement of the brain relative to body size, was especially pronounced over the past 800,000 years, coinciding with the period of strongest climate fluctuation worldwide. Larger brains allowed hominins to process and store information, to plan ahead, and to solve abstract problems.”

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“A warmer climate means malaria, West Nile virus and other diseases long confined primarily to the tropics will spread into temperate zones. As a result, people living in the U.S. and other developed nations will be exposed to these illnesses, and our immune systems will be forced to evolve new defences.”

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“The pigment eumelanin makes skin darker, which helps protect against harsh sunlight. But too much eumelanin can make it hard for the body to produce vitamin D, which is needed to build healthy bones. So over many thousands of years, human populations evolved varying levels of skin pigmentation as they spread across the globe, with natural selection balancing the cost of having too much eumelanin (which can indirectly cause bone deformities) versus having too little (which can lead to cancer and birth defects). As a result, skin color came to closely match the intensity of sunlight in different regions — darker near the equator and lighter near the poles.”

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“Similarly, our digestive systems will evolve in response to shifts in food availability — where crops and livestock can be cultivated...Changing diets will also trigger changes in our microbiomes — the bacteria and other microorganisms that live in our guts and help to keep us healthy.”

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Climate Fluctuation pushes the human brain to enlargen the more it made them think and problem solve over time.

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Climate Fluctuation pushes the human brain to enlargen the more it made them think and problem solve over time.

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Climate that have native diseases can push people to strengthen their immune system.

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Climate that have native diseases can push people to strengthen their immune system.

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Exposure of sunlight can cause shift in skin colour through high or low melanin production.

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Exposure of sunlight can cause shift in skin colour through high or low melanin production.

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The Food Availability pushed humans to evolve their digestive systems.

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The Food Availability pushed humans to evolve their digestive systems.

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What factors of the environment influenced Human Evolution?

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What factors of the environment influenced Human Evolution?