The stability of atoms depends on whether or not their outer-most shell is filled with electrons. If the outer shell is filled, the atom is stable. Atoms with unfilled outer shells are unstable, and will usually form chemical bonds with other atoms to achieve stability.
<span>One of the advantages of genetic engineering is the ability to add vitamins and minerals supplements to food. The correct option is D. The other options given are disadvantages of genetic engineering. Apart from the advantages given here, genetic engineering has other merits, such as production of better agricultural products, increasing shelf life of products, elimination of diseases, etc.</span>
