Which of the following animals are diploblasts?

Question

Sponges, jellies, sea anemones, roundworms, crayfish, or clams

 

Answer 1

Hi there!

The animals on this list that would be diploblasts are jellies and sea anemones. Diploblasty has to do with the blastula, a sphere of cells that is created during the embryonic stages of an organisms development. Diplo, meaning two, refers to the blastula cells having two primary germ layers. These layers are the ectoderm and endoderm.

Essentially, organisms that are very simple, such as roundworms would have only one germ layer and the more complex organisms on the list (crayfish or clams) would most likely have blastula cells with more germ layers. The jellies and sea anemones are a kind of in-between.