Chapter 17, Problem 9STP

Summary Introduction

To list and explain:

Three primate adaptations found in humans that relate to a tree- dwelling habitat.

Introduction:

Humans, apes, lemurs and monkeys re called primates. They share some general features such as high level of manual dexterity, keen eyesight, long, movable arms, and large brains. The primates with large brains have the capacity to reason.

Answer to Problem 9STP

Three primate adaptations found in humansare:

1. An opposable first digit
2. Binocular vision
3. Flat nails instead of claws

Explanation of Solution

Three primate adaptations found in humansthat relate to a tree- dwelling habitat are:

1. An opposable first digit- The first digits on most primates’ hands and feet are opposable. An opposable thumb or toe is different from other digits. It can be brought across the palm or foot so that it touches the other digits. This action helps the primate to grasp an object in a powerful grip. This adaptation helps the primate to live on trees as they can firmly grasp the branches and their food with opposable thumbs and toes.
2. Binocular vision- The primates have eyes protected inside bony eye sockets. The eyes are located on the front of their face. This creates an overlapping field of vision called the binocular vision. This This adaptation helps the primate to live on trees as it allows for a greater field of depth perception and enables the primate to judge relative distance and movement of an object.
3. Flat nails instead of claws- All primates have five digits on each hand and foot. The digits have flat nails instead of claws. The areas on the ends of their digits are highly sensitive. Flat nails help the primates to grasp things better and to support the broad fingertips.