Which of these statements is correct? the endoderm becomes nervous system;the mesoderm becomes muscles and circulatory system;and the ectoderm becomes digestive tract.The ectoderm becomes nervous system;the mesoderm becomes muscles and circulatory system;and the endoderm becomes digestive tract.The mesoderm becomes nervous system;the endoderm becomes muscles and circulatory system;and the ectoderm becomes digestive tract.The ectoderm becomes nervous system;the endoderm becomes muscles and circulatory system;and the mesoderm becomes digestive tract.