In a normal-sighted individual, the will focus images perfectly on a small indentation in the back of the eye known as the .

Lens

Ratina

Explanation:

In the eye the lense refeacts the light coming in through the pupil and then focus it on the small indentation opposite to the lense called Ratina.

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.

c

explanation:

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