sentence2_structure: Carbon (c)<>is<>essential to living organisms<>because carbon bonds in many ways with itself to form chains$$$carbon bonds in many ways with itself<>to form<>chains
sentence1: In the polymerization, the carbon-carbon pi bond (in the vinyl group) is broken and a new carbon-carbon single (sigma) bond is formed, attaching another styrene monomer to the chain.
sentence2: Carbon (c) is essential to living organisms because carbon bonds in many ways with itself to form chains.
question: What characteristic of carbon (C) makes it essential to living organisms?