15. Which of the following statements is/are correct?
A. Cnidarians can not reproduce sexually
B. Members of Cnidaria have an endoderm and ectoderm.
C. Nematocysts are stinging structures that Cnidarians and many other animal Phyla possess.
D. Given the following on the organism:
I. An animal
II. Multicellular
III. has tissues (diploblastic)
IV. lacks organs
V. is radially symmetrical
This organism could be a member of the Phylum Cnidaria
E. Sea anemones are members of the phylum Echinodermata

Option B,C, D and E.

Explanation:

Phylum cnidaria are group of animal species found mostly in aquatic habitats and most of they live in marine habitat. They have cnidocytes, specialized cells used for capturing prey which contain nematocysts organelles. They have mesoglea present between two layers of epithelium. They are radially symmetrical with tentacles surrounding their mouth. They have two body forms, the swimming Medusa and the sessile polyps.

Nematocysts is stinging organelles found in cnidaria and other animals for stinging their prey.

Sea anemone is a member if phylum echinodermata.

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

credit: gradman555p98x9p

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b) the inside picture would look at a very high temperature in a very low ph