eye

The part of the eye that limits the amount of light that reaches the retina is called

 eye

The part of the eye that limits the amount of light that reaches the retina is called the iris. The iris shrinks and lets in less light while it's bright outside, and the opposite is true at night.

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Redder is better, obviously

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Threats Exist for Three Species.

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The use of asthma inhalers can be challenging. With a Spacer, Side Effects are Reduced.

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Harvard has a history of high achievers

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Incredible engineering marvels were required during construction.

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Butterflies have a short lifespan.