Muscle cells have many mitochondria for a) energy. b) protection. c) divisibility. d) reproduction

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 d not too sure but i think it's right

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.