Manipulation of the independent variable should change the dependent variable, the value of which "depends" on the independent variable's change in value.
Amino acid is not found in a nucleotide.
Flood water will ruin the clean water. This will cause the water to be undrinkable. Flood water will get into homes and ruin roads. Even though it may seem like it is doing a good thing by adding more water, the water is not filtered and clean for drinking.
