The monomer must be able to form stable covalent chemical bonds between units in order to polymerize.
it would be thermoreceptor but i think it is A) pain receptor
those are nucleotides
since all three of them contain deoxyribose (because there's only one hydroxil group) they are DNA nucleotides
the first nucleotide has cytosine as it's nitrogenous base
the second nucleotide has adenine as it's nitrogenous base
the third nucleotide has thymine as it's nitrogenous base
