TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Method: The method further comprises enzymatically breaking down at least a portion of the substrate to produce at least one product; and recovering at least one of the polymers by separating at least one of the polymers from the at least one product. The method also comprises: (i) providing additional substrate, additional enzyme or mixture of enzymes, and the at least one recovered polymer; (ii) contacting the additional substrate with the additional enzyme or mixture of enzymes in the presence of the at least one recovered polymer; and (iii) enzymatically breaking down at least a portion of the additional biomass. The enzymes are selected from cellulases, hemicellulases, lignases, lipases, amylases, phosphatases, and xylanases.    TECHNOLOGY FOCUS - POLYMERS - Preferred Method: In the method, the monomer residues having the structure of formula (I) are monomer residues of formula (I-A1).R(A1)=unsubstituted or substituted-aliphatic group-, unsubstituted or substituted-alicyclic group-, unsubstituted or substituted-aryl-, unsubstituted or substituted-heteroaryl-, or unsubstituted or substituted-heterocyclyl-; andR(A2) and R(A3)=H, unsubstituted or substituted aliphatic group, unsubstituted or substituted alicyclic group, unsubstituted or substituted aryl, unsubstituted or substituted heteroaryl, or unsubstituted or substituted heterocyclyl.The monomer residues having the structure of formula (I) are monomer residues of formula (I-A2), where the monomer residues of formula (I-A2) are formula (1) or (2). The polymers are a homopolymer or a copolymer, where the copolymer comprises a set of first monomer residues of formula (I-A2), where R1 is H or alkyl; R(A) is unsubstituted alkyl; and R(B) is H; and a set of second monomer residues of formula (I-A2), where R1 is H or alkyl; R(A) is unsubstituted alkyl, or alkyl substituted with 1-5 -OH groups; R(B) is H, provided that at least one of R1, R(A), and R(B) of the first monomer residues is different from R1, R(A), and R(B) of the second monomer residues. The set of first monomer residues are formula (2); and the set of second monomer residues are selected from: formulas (3), (4) and (5). The copolymer further comprises a set of aminooxy-bearing methacrylamide monomer residues independently having a structure of formula (II-B1) or (II-B2).R1=H or alkyl;r=greater than or equal to 1;X=unsubstituted or substituted -aliphatic group-, unsubstituted or substituted -alicyclic group-, unsubstituted or substituted -aryl-, unsubstituted or substituted -heteroaryl-, unsubstituted or substituted -heterocyclyl-, unsubstituted or substituted -ether-, or -(CH2)jNHCO-;j=1;R2 and R3=H, unsubstituted or substituted aliphatic group, unsubstituted or substituted alicyclic group, unsubstituted or substituted aryl, unsubstituted or substituted heteroaryl, unsubstituted or substituted heterocyclyl, or -C(O)R(a), or R2 and R3 are taken together with the carbon to which they are attached to form a 5- or 6-membered unsubstituted or substituted heterocyclyl; andR(a)=H, alkyl, or hydroxy.The aminooxy-bearing methacrylamide monomer residues of formula (II-B1) have a structure of formula (II-B1a) or (II-B2a).X=-ethylene glycol- or -(CH2)jNHCO-.Moreover, at least one of the polymers is thermally-responsive, and at least one of the polymers has a low critical solution temperature (LCST) of at least 10 degrees C. Preferred Composition: Alternatively, the composition comprises: at least one residual substrate; at least one product; at least one enzyme; and at least one polymer comprising a set of monomer residues having the structure of formula (I). EXAMPLE - No suitable example given.