What would be some of the properties of molecules that could be candidates for biological magnification?

Explanation:Toxic materials e.g synthetics

They become even more toxic as they are converted to more toxic products by reaction with other substances or by metabolism of microorganism

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.

thinking it would be physical characteristics