Examine the food web shown in figure 5-4. what would most likely happen to the organisms in this ecosystem if the algae began to disappear

I'll give it to you simple...

Explanation:

...something eats the algae, and relies on it. Algae dispears, so does the thing that relies on it, and the thing that relies on the thing... so on... the ecosystem would completely UNFOLD.

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