If two atoms are isotopes of the same element, what will they have the same number
of? What will they have a different number of?
same number of protons; different number of neutrons
O same number of neutrons; different number of electrons
same number of neutrons; different number of protons

same number of protons

They'll have the same number of protons and a different number of neutrons

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.

where is the diagram?

if you insert the diagram ill be able to you