試題詳解

41. Which one of pairs is matched correctly for the germ layers from which animals evolve?
(A) Ectoderm-muscle.
(B) Mesoderm-outer covering.
(C) Endoderm-internal linings of digestive tract.
(D) Mesoderm-nervous system. 
(E) Ectoderm-internal linings of liver and lungs.