Many isotopes are___
because they have too
many or too few neutrons in their nucleus.

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis

Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these

49 ! how are energy cycles and growth cycles related?