In Biology, What is the Difference Between Triploblastic and Diploblastic?
In the Animal Kingdom, most phyla have three primary tissue layers: a ectoderm, mesoderm, and endoderm. The ectoderm is the outside layer, the mesoderm forms the wall of the body cavity (coelom) and the endoderm forms the internal organs. This is called triploblastic. The three layers are especially clear during embryological development. Other phyla have just two primary tissue layers: an ectoderm and an endoderm. These are the phyla Cnidaria and Ctenophora. Cnidarians include jellyfish, corals, sea pens, sea anemones, sea pansies, sea wasps, and sea fans, while ctenophores are referred to as comb jellies. These simple animals lack body cavities and true organs. They are referred to as diploblastic because of their dual-layered nature. Triploblastic animals are believed to have evolved from diploblastic animals between 580 and 650 million years ago. The body cavity may have evolved from the stomach pouch present in jellyfish. Very early in the fossil record (between 600 and 542 millio
