You Are Listening to a Debate on the Processes of Neurulation

Multiple Choice

You are listening to a debate on the processes of neurulation in mammals compared to fishes. Both speakers agree that in fish, neurulation involves cells from either side of the midline coming together completely to form a seam, as opposed to most other vertebrates whereby two neural folds rise upwards on either side of a neural groove and then fold towards each other and meet to form a tube. Speaker one asserts that in fish, because of the morphology of the resulting structure, this processes produces a 'neural keel', whereas speaker two states that this process results in a 'neural tube'. Which speaker, if any, is correct?

A) Neither, neurulation in fish at this developmental stage produces a neural plate
B) Neither, neurulation in fish at this developmental stage produces a neural groove
C) They are both correct - either term is acceptable
D) Speaker one
E) Speaker two