What is the atmosphere? Where does weather occur?

What does the atmosphere protect us from? Which layer?

What would happen if we didn't have the protective layer in the previous question?

What happens in the mesosphere?
What is made in the thermosphere?

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.

the correct answer: the index of refraction of the second medium is lower i tried this persons answer and it was wrong this person is lying

glycolysis is a process that fuel your metabolism. it is apart of cellular respiration the process that produce atp.