21. Sound waves travel slowly through warm air than cool air.

As a small change in a person's dna can cause a genetic disorder

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

What problem would a person most likely have if her kidney did not work correctly?