Biology is the "Study of Life." We have studied life at the cellular level in this course Describe one of the processes we learned about in Units 1 to 4 that keeps a cell at homeostasis.

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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.

i think it is dna, i'm not totally sure but i think it might be.