15. all of the following would result in a change in population size except a. emigration of individuals out of the population range. b. equal birth and death rates. c. the death rate exceeding the birth rate. d. immigration of individuals into the population range.

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.