M
+
+
Cl2 +
KI ->
KC +
12

displacement reaction.

Explanation:

When chlorine gas is passed through a solution of potassium iodide, as a result of this reaction the products i. e. solid iodine and potassium chloride are formed. This type of reaction is called a displacement reaction because in this reaction the less reactive iodine that is attached with potassium iodide is replaced by the more reactive chlorine molecule so the displacement of atoms held so we called it displacement reaction.

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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