Question

failure of the superior neural tube to close causes a fatal condition called
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Explanation:

Neural tube defects occur when the neural tube fails to close properly during embryonic development. Anencephaly specifically results from the failure of the superior (rostral) neural tube to close. In anencephaly, large parts of the brain and skull do not form. It is a fatal condition as infants with anencephaly usually die shortly after birth.

Answer:

Anencephaly