In general, locomotion on land will require more energy than locomotion in water. By integrating what you learned about animal form and function in unit 7, discuss some of the evolutionary adaptations of mammals that support the high energy requirements for moving on land.

1. Locomotion on land raises different problems than that in water, with reduced friction being replaced by the effects of gravity.

2:

A well-developed closed circulatory system is an important adaptation for the high energy costs of land living. The circulatory system allows oxygen to be transported to cells at a rate that is acceptable for the energy requirements of terrestrial living.

3:

Well-developed lungs as a means of gas exchange is also an important adaptation in providing sufficient oxygen for metabolic processes involved in terrestrial living.