he best way to classify two different organisms that have similar appearance and are found in the same environment is to A) compare cilia and flagella. B) use a stain to determine the acid-base balance. C) use gel-electrophoresis to compare DNA patterns. D) use nuclear membrane sampling in the case of prokaryotes.

The correct answer is option C

The best way to classify the organism when they appear similar and found in the same area must be observed by studying the genotype of the organism.

Sometimes it is not possible to observe the change in the organism by looking physically (phenotype) so, in this case we must use the gel electrophoresis to compare the DNA pattern.