Ethylene glycol and terephthalic acid are monomers of which of the following polymer?

The structure given below is an example of
$I$. $A$ condensation and biodegradable polymer.
$II$. $A$ biodegradable and thermoplastic polymer.
$III$. $A$ biodegradable and thermosetting polymer.
$IV$. $A$ polyester and thermoplastic polymer.

Which one of the following structures represents the neoprene polymer?

The mass average molecular mass and number average molecular mass of a polymer are respectively $40,000$ and $30,000$. The polydispersity index of the polymer will be:

Name the polymer used in laminating sheets and give the name of monomeric units involved in its formation.

Why have biodegradable synthetic polymers been designed and developed?