Answer:
In coelomates, the body cavity is surrounded by two germ layers: the mesoderm and the endoderm. The mesoderm is the middle germ layer, and it gives rise to the muscles, bones, blood, and other connective tissues. The endoderm is the innermost germ layer, and it gives rise to the lining of the digestive and respiratory systems. Together, these two germ layers form a "sandwich" around the body cavity, with the mesoderm on the outside and the endoderm on the inside.
Step-by-step explanation: