Neural tube defects (NTD) are birth defects that occur in some specialized regions such as the brain and spinal cord. They are considered and bethink as a complex disorder because they are caused by combination of environmental and multiple genetic factors. Environmental factors include low folic acid intake, maternal use of certain anticonvulsant medications. etc. On the other hand multiple genetic factors can include spina bifida (an phenomena whereby there is incomplete closing of the spine and membranes surrouning the spinal cord at the initial stage of development of fetus in pregnancy.
During pregnancy, folate requirements increase due to the result of rapidly dividing cells related to fetal growth. It is of great advantage that pregnant woman should increase their folic acid supplements intake to (400-800μg daily) prior to conception, this can help and assist to reduce the risk for neural tube defects in the fetus.
Possession of flagellum is not a taxonomic feature. many different unrelated organisms have flagellum. euglena, zooflagellates but also some fungi or even human sperm cells.
The correct answer would be A. The number of neutrons present in Krypton-82 would be 46. The atomic number of an atom represents the number of protons present while the mass number is the sum of the neutrons and protons in the atom. The mass number for the given atom is 82. So, 82-36 = 46 neutrons present.
