Why are experimental investigations the best type of scientific investigation to demonstrate cause-and-effect relationships?

What is the relation between concentration of reactants and the rate of chemical reaction?

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d

How does the presence of oxygen affect the chemical pathways used to extract energy from glucose?