What job(s) do these parts of a cnidarian have?
1.cnidocytes
2.gastric cavity
3.Ectoderm-outer cell layer of a cnidarian
4.nematocyst
5.inner cell layer of a cnidarian

i think it is dna, i'm not totally sure but i think it might be.

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above

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