Chang wants to build a circuit that will light up the bulb from a flashlight. which component could chang leave out and still light up the bulb?

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

geologic time scale (for gradpoint) =)