Fair. Both are sufficiently ancient, but cellulose bearing species diverged earlier chitin bearing ones. Exact timing on it tho is nebulous. So either will do.
I only mention cellulose specifically because it is the historic precursor to the first man made plastic, celluloid. But there are now processes to convert chitin to chitosan, which is a moldable plastic.
Weren’t the first plastics made of the original biopolymer? Celluloid from cellulose?
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Fair. Both are sufficiently ancient, but cellulose bearing species diverged earlier chitin bearing ones. Exact timing on it tho is nebulous. So either will do.
I only mention cellulose specifically because it is the historic precursor to the first man made plastic, celluloid. But there are now processes to convert chitin to chitosan, which is a moldable plastic.
Donno but sounds plausible