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Primates represent one of the most successful and diverse orders of mammals, and their evolutionary trend reflects a long process of adaptation to changing environments over millions of years. The evolutionary history of primates began approximately 65 million years ago, shortly after the extinction of the dinosaurs, when early mammalian ancestors diversified to occupy new ecological niches. The evolutionary trend of primates is characterized by progressive anatomical, physiological, and behavioral modifications that improved survival, mobility, feeding efficiency, sensory perception, and social organization. Biological anthropology studies these trends to understand the origin and evolution of humans and their closest relatives. One of the most significant evolutionary trends in primates is the adaptation to arboreal life. Early primates evolved in forest environments where living in trees required specialized features for climbing and grasping. Their limbs became flexible, and the hands and feet developed opposable thumbs and, in many species, opposable big toes. These features enabled efficient grasping of branches and improved locomotion among trees. Nails gradually replaced claws in most primates, allowing greater sensitivity and precision in handling objects. Another major trend is the improvement of vision. Primates evolved forward-facing eyes, resulting in binocular and stereoscopic vision. This adaptation provided accurate _________ ____ __________ _______ ________ ______ ____ ____ ________.
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