 It has been suggested that chimpanzee knuckle-walking and gorilla knuckle-walking are biomechanically and posturally distinct.
<coherence>  It has been suggested that chimpanzee knuckle-walking and gorilla knuckle-walking are biomechanically and posturally distinct.
 Chimpanzee knuckle-walking and gorilla knuckle-walking are biomechanically and posturally distinct.