Which of these is an example of mechanical weathering? select one: ice wedges creating potholes in the middle of a street houseplants releasing oxygen into the atmosphere waves lapping against the sandy shores of a beach acid rain falling onto a marble statue in the town square

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.

littering streams           is the answer

because of