The only difference in the chemical structure of DNA between various organisms is--- the number of nucleotides present

the order of base pairs

the variety of bases

the number of bases in a codon

Sea stars, sea urchins, sand dollars, and brittle stars are all memeber of a group, what is the common name of the group they are all in

Reactants undergo chemical reaction to form products. this chemical equation represents one such reaction. the coefficient for one of the reactants or products is incorrect. which part of the chemical equation is incorrect?

Why is the limitations on supplies of freshwater becoming an increasing problem despite the fact that we have desalination technologies