Phenotypes that have a range of variability (not discrete differences such as mendel's pea flower color), are typically a resuit of
a. polygenic inheritance
b. independent assortment
c. gene linkage

b. independent assortment

Explanation:

Phenotypes that have a range of variability (not discrete differences such as Mendel's pea flower color), are typically a resuit of independent assortment.

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.