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PRIMATES

PRIMATES

Modern primates have not always existed, nor have they existed since the first appearance of fossil primates. The first primates were preceded by mammals which resembled them more than do any modern primates. Modern primates form a clade which shares a number of features of the skeletal system ( a complete postorbital bar, reduction of the lacrimal bone, bony protection behind eye), nervous system (enhanced visual system, increased extension and size of the corticospinal tract, an enlarged cerebellum, enlarged cerebral hemispheres extend over part of the olfactory bulb, shared areas of the fronto-parietal cortex, Broca’s area, shared gyri and sulci), reproductive system (labia minora), and other changes (η globin and the inactivation of the enzyme to synthesize vitamin C).

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