You Are Conducting an Experiment That Requires You to Start

Multiple Choice

You are conducting an experiment that requires you to start a treatment on amphibian embryos when the nervous system starts developing.At which stage will you start the treatment?

A) When neural crest cells begin migrating
B) When the ectoderm overlying the notochord flattens into a platelike structure and thickens
C) When the neural tube forms anterior bulges
D) When the somites have finished forming the vertebrae
E) When the chordamesoderm begins involuting