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Project title How does the iris work?
Difficulty Level Elementary school
Main link Click here to view all details of this science project (Cached)  (View 3rd party site)

Description
The iris is the muscle that lets the proper amount of light through the pupil and into the eye. It opens when there is little light and closes when there is a lot. The students can illustrate this for another.  

Materials
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Brief Instructions
[Please see third-party website for instructions]
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