Spina bifida and anencephaly are examples of neural tube defects. Women who have had a pregnancy resulting in the birth of an infant with a neural tube defect are being urged to take supplements of before a second conception to decrease the risk of these birth defects.

folic acid

Explanation:

Spina bifida and anencephaly are examples of neural tube defects. Women who have had a pregnancy resulting in the birth of an infant with a neural tube defect are being urged to take supplements of folic acid before a second conception to decrease the risk of these birth defects.

Neural tube defects are congenital defects associated with the brain and the spinal cord in which the brain and the skull of the fetus refuse to develop (anencephaly) or the spinal cord refuses to close up as it should (spina bifida).

Neural tube defects has been found to be preventable by adequate consumption of folic acid before and during pregnancies.

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.