Of the three primary germ layers, which is responsible for developing into nervous tissue?
a) endoderm
b) ectoderm
c) mesoderm
d) all three primary germ layers develop into some
type of nervous tissue.

D. All three primary germ layers develop into some more type of nervous tissue

Explanation: All of the primary germ layers have specific nervous tissue development. a) Ectoderm - neuroectoderm (neural tube, neural crest). b)   Endoderm develops into (among others):   The digestive tract and its attached glands; the inner lining of some organs, such as the lungs, nervous tissue; epidermis  . c) Mesoderm - notochord signals the ectoderm to develop the neural crest more

the correct answer is d

c. heat from the poles back down towards the equator.