evolutionary adaptation

The image titled "Skin Pigmentation Diagram" illustrates the role of melanin in determining skin color, comparing the cellular structure of dark and light skin. Located in the epidermis, melanocytes produce melanin, which is then taken up by keratinocytes, influencing the skin’s pigmentation. This diagram highlights the distribution and density of melanin across different skin tones, offering insight into the biological basis of skin color variation. This article explores the mechanisms of skin pigmentation, the anatomical role of the epidermis, and the physiological processes that regulate melanin production.

This detailed diagram illustrates the complex anatomy of generalized tribosphenic molars, highlighting the distinctive features of both upper (maxillary) and lower (mandibular) molars from multiple perspectives.

This diagram illustrates a generalized tribosphenic left upper molar, highlighting the three primary cusps that define this distinctive dental morphology.