Question

neural tube defects are birth defects of the _________ and ________.
a. neurons... umbilical cord
b. brain... spinal cord
c. brain... umbilical cord
d spinal cord... umbilical cord
please select the best answer from the choices provided
a
b
c
d

Explanation:

Neural tube defects occur when the neural tube (which develops into the brain and spinal cord) fails to close properly during embryonic development. The umbilical cord is not part of the neural tube structure. Neurons are cells within the nervous system (brain and spinal cord) but the defect is about the structures (brain and spinal cord), not just neurons. So the correct answer is B as neural tube defects affect the brain and spinal cord.

Answer:

B. brain... spinal cord