The diagram shows two charged objects, a and b.

based on the field lines, what are the charges of the objects?

a: positive
b: negative
a: negative
b: positive
a: negative
b: negative
a: positive
b: positive

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.

it is a learned trait

explanation: