Final answer:
Forward facing eyes and nails at the end of each digit are common traits shared by almost all primates, enhancing their visual acuity and manual dexterity.
Explanation:
Forward facing eyes are found in almost all primates and are a shared characteristic that aids in depth perception and gauging distance. This feature results from their reliance on vision over olfaction. Additionally, nails at the end of each digit are another common trait in primates, replacing claws for enhanced dexterity. These traits, along with others like a larger brain/body ratio, define primates distinctively.
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