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E chemical - PowerPoint PPT Presentation

The pupils constrict (become smaller because) they are taking in more light.

The pupils constrict (become smaller because) they are taking in more light. The pupils dilate (become bigger because) They are taking in less light. Snakes use heat sensors to hunt. -Dolphins use SONAR by projecting a sound and waiting for that sound to bounce off of

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E chemical - PowerPoint PPT Presentation

The pupils constrict (become smaller because) they are taking in more light.