Answer:
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.
