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Why does the body attack a transplanted organ?

The organ has pathogens that the body wants to destroy.

The organ is not recognized by the body as being made of self cells.

The organ's pH level is not compatible with the recipient's pH level.

The organ does not have enough nutrients to support the body.

Answer: Because it doesn't recognise that it is an organ.

Explanation:

It's like putting a foreign object in your body and the immune system recognised it as an enemy or virus and does what it would do to a virus. Tries to destroy it. If you wanted to have a more successful transplant you could try immunosuppressant