Humans are ____________ - meaning we walk on two of our limbs. The amount of melanin in our skin is representative of the environment we live in - i.e. dark skinned people occupy hotter climates.

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1. Humans are ____________ - meaning we walk on two of our limbs. The amount of melanin in our skin is representative of the environment we live in - i.e. dark skinned people occupy hotter climates.