Deficiency is the developing world’s most common cause of preventable brain damage.
a. iron
b. vitamin a
c. iodine
d. calcium

Sorry i dont understand the question can you rephase it?

Iam not going to tell you

The atomic nucleus made up from protons (yellow) and neutrons (blue) and held together by nuclear forces. nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. they bind protons and neutrons (“nucleons”) into atomic