Which is a carbohydrate?
amino acid
nucleotide
polysaccharide
nucleic acid

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects