Agroup of students is trying to guess which organism their teacher is thinking of by asking her a series of questions. one of the students asks if the cells of the organism contain ribosomes. will the teacher's answer her students shorten the list of possible organisms?

Explanation:

I don't think so that teacher's answer going to help her students in shorten the list because every living organism on this planet is composed of cells and cells of organism contain small organelle. For example, Elephant contain these small organelle and even single celled organism such as prokaryotic cell also contain this small organelle within it's cell.

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.