Which layer of the atmosphere has the highest layer of gas molecules

Troposphere

Explanation:

The mixture of gas molecules is no longer consistent and molecules with higher mass sink to lower layers. Therefore the Troposphere is the lower layer so it contains the highest gas molecules.

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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.

it is either c or d and i know for sure it is not a or b