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Explanation:

1. The Troposphere is the First Layer, it contains where all the weather occurs

2. The Stratosphere, (2nd layer) has the Ozone Layer included

3. The Mesosphere is the coldest layer of the atmosphere

4. The Thermosphere gets the most Sun UV radiation

5. The Exosphere is where satellites orbit

Hope this helps!

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.