Which is best illustrated by watson and crick's ball-and-stick model of dna? a. the importance of sticking to established methods of science. b. the role of creativity in scientific discovery. c. the value of individual scientists working independently from one another. d. the importance of carrying out procedures that can be replicated.

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.

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explanation:

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