I would go with A because its the only one that makes since. The pencil would have to fall eventually, and out of process of elimination I'd go with A .
Hope this helps ...
It's A, because it's always important to drink water. If you think about it, all the other answers seem invalid.
Fatty acids vary in their degree of saturation or unsaturation due to their number of :Double bonds
They will both have controls!
Question- Which molecule is correctly paired with its building blocks?
Answer- carbohydrate-monosaccharides
