HELP PLEASE! I will give on the correct and detailed answer! What are the benefits of using standard deviations and are there any downsides when we are trying to describe variability? Can standard deviation be used if there are downsides?

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.

not sure if this is what you'r looking for eubacteria and archaebacteria