The copolymer styrene-butadiene rubber (SBR), shown below, is used for making tires as well as bubble gum. Is it an addition polymer or a condensation polymer?
A. SBR is both an addition and a condensation polymer.
B. SBR is an condensation polymer.
C. SBR is neither an addition nor a condensation polymer.
D. SBR is an addition polymer.
Answer: D
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