What chemical speeds up the process of decomposition in dead organisms are exposed to it? nitrogen oxygen hydrogen chlorine

Correct answer is Oxygen (the other answer is wrong)

Explanation:  Exposure to oxygen, bacteria, and scavengers will cause decomposition to occur quickly. The first parts to decompose are soft tissues, like skin and organs. The last parts to decompose are hard parts like bones, teeth, shells, spines, or plates.

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.

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