The images represent sexual and asexual reproduction. The offspring in images B and C are identical to the parents while the offspring produced in images A and D will vary from the parents. What processes account for the genetic variation in images A and
D?
A) pollination & fertilization
B) meiosis, mitosis, & mutation
c) production of sex cells via mitosis & zygote development via fertilization

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.

that is wrong, its not thymus.

is this a question? wassup