Which among the following polymers is obtained from styrene and $1,3-$Butadiene?

Why are rubbers called elastomers?

Which of the following is a biodegradable polymer?

Which of the following statements are correct?
$a$. Natural rubber becomes soft and sticky at high temperature.
$b$. Neoprene is a polymer of $2-$chloro$-1,3-$butadiene.
$c$. Nylon $6,6$ is a polyamide fibre.
$d$. Buna$-S$ is an example of a homopolymer.

Example of a biodegradable polymer pair is

Nylon $-6, 6$ is