Which of the following is an example of homeostasis? the lungs of animals excrete carbon dioxide. the beaks of some birds are hooked in shape. we feel cooler when we stand under the shade of a tree. we feel warmer when all the windows are shut on a cold night.

Explanation:

This is the most logical answer, because others don't have any common point with homeostasis.

Remember that homeostasis refers to all processes that are internally develop in a system in order to maintain the equilibrium, reacting to external stimulation. Which is the case in the first option, carbon dioxide expulsion from animal's lungs is a homeostasis process, because it help to maintain the standard function of the internal systems.