A liquid and a solid mixed together. What does NOT indicate that a chemical change has taken place?

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

Which would be the most useful source of evidence to support mcneill's contention?

What is responsible for the uneven heating between the poles and the equator on any given day