EVERYDAY SCIENCE

Detailed explanation-1: -By the process of gastrulation, the embryo differentiates into three types of tissue: the ectoderm, producing the skin and nervous system; the mesoderm, from which develop connective tissues, the circulatory system, muscles, and bones; and the endoderm, which forms the digestive system, lungs, and urinary system.

Detailed explanation-2: -Three primary germ layers The mesoderm specifies the development of several cell types such as bone, muscle, and connective tissue. Cells in the endoderm layer become the linings of the digestive and respiratory system, and form organs such as the liver and pancreas.

Detailed explanation-3: -The mesoderm gives rise to the muscle cells and connective tissue in the body.

Detailed explanation-4: -As the primitive streak regresses and the neural folds begin to gather at the center of the embryo, the paraxial mesoderm separates into blocks of cells called somites.