Researchers have found a gene in yeast that codes for a myosin protein, which is also coded by gene in humans, what does this similarity at the molecular level in yeast and humans indicate?
a) humans and yeast share common ancestry
b) humans and yeast contain the same genetic code
c) humans and yeast belong to the same kingdom

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.