Which organ system includes the heart and blood vessels? Which organ system includes the kidneys?

The cardiovascular system includes the heart and blood vessels.

The urinary system consists of the Kidneys.

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.

you should wear a lead protective shield when having teeth x-rays

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-lavira : )