What type of polymer (elastomer, fibre, thermoplastic or thermosetting) a given polymer is

The same question, asked 3 times: 11 Apr 2026 S2*, 13 Apr 2026 S1*, 15 May 2026 S1. Every wording below, oldest first.

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Question 1
11 Apr 2026 S2
47 $Buna - S is an example of ,$
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Question 2
13 Apr 2026 S1
49 $What type of polymer the natural rubber is?$
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Question 3
15 May 2026 S1
48 $What type of polymer is the polystyrene?$
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