1. The notochord develops primarily from (a) ectoderm, (b) neural crest, (c) mesoderm, (d) endoderm. 2. The fetal period is (a) from weeks 9–38, (b) the time of rapid growth of body organs, (c) a time...

1. The notochord develops primarily from (a) ectoderm, (b) neural crest, (c) mesoderm, (d) endoderm.

2. The fetal period is (a) from weeks 9–38, (b) the time of rapid growth of body organs, (c) a time of cell differentiation, (d) all of the above, (e) none of the above.