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Yet there are more people living today than have

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Unformatted text preview: hic area developing and retaining similar physical characteristics. The physical characteristics possessed by a group in a particular geographic area may reflect adaptations to the different environments in which the ancestors of that group of individuals lived for many generations. Although the concept of genetic adaptation is still debated, most scholars agree that it is probable that human beings have adapted biologically to such conditions as climate, disease, and diet. For example, the physical response of humans to a hot environment is to cool off through perspiring. Although all humans seem to have the same number of sweat glands, peoples of hot, dry climates where it is especially important to be able to cool off tend to be tall and slim, with a maximum of skin available for potential cooling by sweating. In Arct...
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