There are about 200 grams of protein in the blood plasma and normally none in the urine. what mechanism keeps protein out of the urine, and what structure would be potentially damaged if protein were found in significant amounts in urine

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.

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.