Answer :
The example of arboreal adaptations which are characteristic to modern primates is: (4) opposable thumbs.
Arboreal adaptations are those that are present in animals that live on the trees. For example, many of the monkeys have great arm strength in order to swing on the trees. Camouflage is also an adaptation in some organisms, like chameleons. Such organisms also have greater balancing ability.
Opposable thumb is an adaptation where the thumb can be moved and rotated very easily and can also be placed behind the fingers of the same hand. This adaptation can be observed in animals like chimpanzees, orangutans, and other variants of apes; certain frogs, koalas, pandas, etc.
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