What type of data is recorded by the electrocardiogram? A.
the sound of the heart beating
B.
the amount of oxygen in the blood
C.
the electrical activity of the heart
D.
the force from the heart beating

answer; /// i believe the name your looking for is called (plaque)or check good luck

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.