Question

What part of the environment is most crucial to the development of skin pigmentation over human development and across geographic locations? How do we know that the earliest members of the human species were all darkly pigmented?

Answer 1

The environment which is most crucial to the development of skin pigmentation is the intensity of incident UV radiations.  

What do you mean by Environment?

The Environment may be defined as the surroundings or conditions in which a person, animal, or plant lives or operates and performs its specific functions.

Melanocyte stimulating hormone is responsible for the pigmentation of the skin. It is highly produced in hot, warm, and humid conditions. So, the skin color of Caribbean people may be found to be dark.

Therefore, the environment which is most crucial to the development of skin pigmentation is the intensity of incident UV radiations.  

To learn more about Skin pigmentation, refer to the link:

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Answer 2

Answer:

The part of the environment that is most crucial to the development of skin pigmentation overhuman development and across geographic locations is the intensity

Explanation: