What is the correct order from smallest-largest structure within the lungs?

The largest airway structure is the trachea. This branches into two smaller bronchi, which enter the left and right lung and bifurcate further into smaller bronchioles. The bronchioles give way into the smallest structures of the lung, the tiny grape-like clusters of alveoli.

Explanation:

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stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms