PCR is commonly used in research, forensics, and for the diagnosis of pathogens and genetic diseases. A commercial standardized diagnostic PCR test has been developed that uses one set of primers to amplify a short DNA template. For which scenario would such a standardized PCR test be most appropriate

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.

b is the correct answer