How long does it take our eyes to fully adapt to darkness

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How did evolution ever lead ostriches to hide their head in the sand when an enemy approaches?

How long does it take our eyes to fully adapt to darkness?

How can we differentiate so many different foods if we can only taste four flavors on our tongue: sweet, bitter, sour, and salty?

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Reference no: EM132752167

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How long does it take our eyes to fully adapt to darkness : How did evolution ever lead ostriches to hide their head in the sand when an enemy approaches?
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