Cornea transplant in humans is almost never rejected. This is because:

It is composed of enucleated cells

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It is a non-living layer

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Its cells are least penetrable by bacteria

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It has no blood supply

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Solution

The correct option is D It has no blood supply
Cornea is a thin transparent outer layer of the eye that lacks blood vessels but is rich in nerve endings. Hence, cornea transplant in humans is never rejected.

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