Which of the following statements is true?

Question

Quizplus · Accepted Answer

Triploblastic organisms have three embryonic layers: an outer ectoderm, a mesoderm, and an inner endoderm. A is incorrect because the deuterostome mouth originates from the second opening after formation of the blastopore. B is incorrect because diploblastic organisms have only two embryonic layers: an outer ectoderm and an inner endoderm. C is incorrect because ctenophores have two embryonic layers, but the outer layer is ectodermal and the inner layer is endodermal.

Which of the Following Statements Is True