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(1)        Show the name of each chemical.

(2)        State the chemical reactions that describe the main degradation processes of these chemicals when they are implanted into a human body.  

(3)        Explain the difference in the degradation processes between that in a human body and that in natural environments.

(4)        In some cases, such degradation damages surrounding tissues.  Show the reason based on the degradation behaviors shown in (2).

(5)        Appropriate copolymers of chemicals (A) and (B) are often used as a scaffold for tissue engineering.  Explain the reason.
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