Which of the following polymers is used for making magnetic recording tapes?

Buna-$N$ is a co-polymer of $1,3-$Butadiene and $\underline{X}$. What is $\underline{X}$?

The polymer used for bulletproof glass coating is ......

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.

$A$ polymer $X$ is biodegradable and is obtained from the monomers $Y$ and $Z$. What are $Y$ and $Z$?

Identify the polymer used in making floor tiles.