The lateral mesoderm is divided into two distinct layers by the formation of the: (A) Extraembryonic coelom, (B) Intraembryonic coelom, (C) Cardiogenic region, (D) Notochord
Answer is B. The lateral mesoderm is a subdivision of intraembryonic mesoderm and initially is a solid plate of mesoderm. The intraembryonic coelom forms in the middle of the lateral mesoderm, thereby dividing it into the intraembryonic somatic mesoderm and intraembryonic visceral mesoderm.