Sharah performs an experiment to determine the effects of nitrogen on plants she studies the effect of nitrogen on the growth of the root hair height of the plants and nodule formation which factor is an independent variable

She studies the effect of nitrogen on the growth of the root hair, height of the plants, and nodule formation.

Explanation:

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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explanation:

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