Ascientific is a rule used to describe a pattern seen in nature, not an explanation of why that pattern might occur.
a. theoryc. systemb. lawd. sequence

Any vitamins or supplements can be obtained without prescription and are widely used as alternative from western medications. most supplements are not valued by the fda or any other drug and food agencies.

Answerionic bond imfs are stronger than covalent;

1b. convection2f. the same