Which of the following would MOST impact the Carbon biogeochemical cycle? Clearcutting a forest.
Starting a vegetable garden in a residential yard.
Weathering of Phosphorus-rich bedrock.
Composting after each meal

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.

sorry, but you do not have posted the diagram.

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