What goes into a reaction and comes out of a

Which of the following describes a boom period? a. as one population increases, another population decreases. b. as one population increases, the other population also increases. c. as one population decreases, another population increases. d. as one population decreases, another population also decreases

Resperation is a way to release carbon back into the atmosphere

Are the layers of rock above and below the coal older or younger?