What is the best way to increase the solubility of something?
a. increase the temperature
b. grind the material
c. a and b are both correct

If scientists are wrong about earth's age based on radioactive material and the decay rates are really much faster, how would nuclear power plants be affected?

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?