Why should you use a new piece of lens paper each time you clean the lenses?

it could be that he lens paper gets dirty each time that you used it,(dont take my answer tho, i dont know ow o wok a camera)

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