What happens before the replication fork can be formed?

A. Base pairs are added.

B. The double helix is unwound.

C. DNA polymerase attaches.

D. Mutations are corrected.

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.

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

true                                                                                                       true true true true true true

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project