With a higher the concentration of hydrogen ions, a solution is more acidic and has a lower pH.  If Jim wants to raise the pH of his solution he should do what to the concentration of hydrogen ions inside of it decrease or increase?
decrease

Genotypes with greater fitness produce more offspring and pass more copies of their alleles to the next generation.  Jean and John were going to have a baby, and they are both in great shape. Jean and John are likely to have offspring in numbers that are greater or smaller?
greater

The darker the urine, the less water it contains.  Joe's urine was almost clear; its water content was probably high or low?
high