Which best describes the relationship between temperature and dissolved oxygen in a lake? A.

As temperature increases, dissolved oxygen increases.

B.

As temperature increases, dissolved oxygen decreases.

C.

As temperature decreases, dissolved oxygen decreases.

D.

A change in temperature has no effect on dissolved oxygen.

B

Explanation:

Gases slightly dissolve in water and are held loosely by weak inter-molecular forces. When the water gains temperatures, the kinetic energy of the water molecules including those of the gases increase. The dissolved gas molecules are therefore able to overcome the weak forces of attraction in the water and escape through the surface.