Which of the following monomers form biodegradable polymers?

Three-dimensional molecules with cross-links are formed in the case of a

Natural rubber and gutta-percha rubber are respectively ...

Which of the following statements are correct?
$(1)$ Biodegradable polymers can be converted into essential life substances after degradation.
$(2)$ Non-biodegradable polymers are active towards environmental processes.
$(3)$ Non-biodegradable polymers can be converted into essential life substances.
$(4)$ $PHBV$ is degraded by bacteria under environmental conditions.

Match List-$I$ with List-$II$:

List-$I$ (Polymer)	List-$II$ (Nature)
$A$. $(-CH_2-C(Cl)=CH-CH_2-)_n$	$I$. Thermosetting polymer
$B$. $(-NH-(CH_2)_6-NH-CO-(CH_2)_4-CO-)_n$	$II$. Fibers
$C$. $(-CH_2-CH(Cl)-)_n$	$III$. Elastomer
$D$. $(-C_6H_3(OH)-CH_2-)_n$	$IV$. Thermoplastic polymer

Choose the correct answer from the options given below.

The polydispersity index $(PDI)$ of a polymer is ($\bar{M}_w = \text{weight average molecular mass}$ and $\bar{M}_n = \text{number average molecular mass}$)