Final answer:
An individual's real skin color is established around the age of six months, influenced by genetic factors and sun exposure, which affect melanin production and contribute to changes in skin tone over time.
Step-by-step explanation:
An individual's real skin color is believed to be established at c. At six months of age. A baby's skin color can continue to change and develop up until this point due to environmental factors and melanin production.
The factors that contribute to changes in skin tone over time include c. Both a and b, which are genetic factors and sun exposure. Genetics primarily determine skin color, but exposure to ultraviolet (UV) radiation from the sun can induce melanin production, which darkens the skin. Furthermore, various other factors such as diseases, hormonal changes, and nutrient deficiencies can also affect skin color over time.
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