A chromatogram has three bands with Rf values of 0.25, 0.47 and 0.82. Which value corresponds to the material with the highest molecular weight? A. Rf = 0.25 B. Rf = 0.47 C. Rf = 0.82

Which statement is a reason to support population regulation? a) it is unethical for us to control birth control rates b) humans have the freedom to produce as many children as desired c) the gap between the rich and poor has been narrowing since 1960 d) billions more people on the earth will intensify many environmental and social problems

Which feature do highland climates have that lower elevation areas do not?

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.