If the force of gravity were to decrease on earth, what might happen to the earth's atmosphere?
a) the amount of oxygen would increase as the earth's atmosphere compressed b) the amount of carbon dioxide woukd increase as the earth's atmosphere spread out
c) all of the gases of the atmosphere would spread out as a result of less gravity, making it harder to breathe
d) there would be no impact to the earth's atmosphere with a change in gravity

a. the amount of oxygen would increase as the earth's atmosphere compressed.

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.

you go to account and hit delete!

explanation: