Which describes a way in which phosphorus may enter into the phosphorus cycle? Earthquakes release phosphorus. Phosphorus is carried in the rain that was evaporated from lakes. Human use of fertilizers release phosphorus into the groundwater. Phosphorus is transpired from the leaves of plants.

the answer is g1

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.

i think the answer is b.

correct answer is a. and d.