How strong does a non-toxic odor have to be before it damages your sense of smell?

Las personas no pueden perder el olfato al menos que sea neurológico la manera mas común es la constante exposición de el olor hasta que se acostumbre y desaparece solo para el, es como un trabajador de recolección de basura, si algo huele mal no le preguntes a el, ya su nariz se acostumbro a la pestilencia de los desechos orgánicos

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.