LIFE SCIENCE

Detailed explanation-1: -The ectoderm is also sub-specialized to form the (2) neural ectoderm, which gives rise to the neural tube and neural crest, which subsequently give rise to the brain, spinal cord, and peripheral nerves. The endoderm gives rise to the lining of the gastrointestinal and respiratory systems.

Detailed explanation-2: -The surface ectoderm will give rise to the epidermis, external glands, hair, nails, anterior pituitary, and the apical ectodermal ridge amongst others. The functions of the surface ectoderm include hormone regulation by the adenohypophysis, acting as a barrier against the external involvement, and homeostasis.

Detailed explanation-3: -The ectoderm gives rise to the skin and the nervous system. The mesoderm specifies the development of several cell types such as bone, muscle, and connective tissue.