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In my scenario the rainforests are now mostly underwater and the chimpanzees have evolved to be slightly larger with longer arms and legs and the hands and feet being slightly webbed to aid in swimming. Also the chimps teeth are naturally sharper to help them eat meat of fish seeing as there will be a drastic increase in them as well as there stomach adapting to eating more meat and less leaves and berries and their lungs larger so they are able to hold their breath underwater for longer.