1-Which muscles contract during iris reflex? 2-Which muscles contract to focus lens for distant objects?
3-which muscle contract for near object?

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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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