Do you think that Earth is overpopulated by
humans? Discuss whether we would be better off
with more people on Earth, by maintaining a
stable population at the current level, or with a
smaller population. Describe some pros and cons
of the scenario that you think is best.

i think less is more

Explanation:

let me explain so i think less would be better because then you wound have as many people that are homeless or refugees we all wish refugees could find safe homes but for all of them that just isn't possible.Then again i don't think that you should resort to genocide when trying to maintain a smaller population.Though one could argue the opposite.

(you can come to your own conclusion this is just my opinion)

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.