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(D) The correct answer is $D$. The cornea is the transparent anterior part of the eye that helps in focusing light. It is avascular,meaning it has no

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it has no blood supply.

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(D) The correct answer is $D$. The cornea is the transparent anterior part of the eye that helps in focusing light. It is avascular,meaning it has no direct blood supply. Because the immune system's cells (like lymphocytes) travel through the blood to identify and attack foreign tissues,the lack of blood vessels in the cornea prevents the immune system from easily detecting or rejecting the transplanted tissue.

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

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Corneal transplantation is highly successful because:

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