The fact that people who live in tropical climates are often tall and lean while people who live in very cold climates is likely a result of

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The fact that people in certain climates have certain physical characteristics can be explained through evolutionary adaptations. Over time, individuals with certain traits that aided in survival in their specific environment had a better chance of passing on their genes to the next generation, resulting in a higher prevalence of those traits in the population. For example, in tropical climates, being tall and lean may help dissipate heat more efficiently and allow for easier movement through dense vegetation, while in colder climates, being shorter and stockier can help conserve heat. Cultural differences or differences in diet can also play a role, but they are not the main driving factor behind physical differences in populations living in different climates.  Gene also plays a role in physical characteristics, but the fact that people living in different climates have different physical traits can still be explained through evolutionary adaptations.

The Fact That People Who Live in Tropical Climates Are