If the caudal portion of the neural tube failed to develop properly the if the caudal portion of the neural tube failed to develop properly the spinal cord may be affected telencephalon would cease development cranial nerves would not form

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

answer; role- taking;

answer; naturalistic observation;