one major difference between acquired traits and entirely genetic traits is that acquired traits
a. must be a result of a mutation
b. cannot be passed on to offspring
c. are only behavioral, never physical
d. do not affect an organism's characteristics

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.

2%? i tried finding the exact sorry if it's not 100% correct ; -;

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.