(blank) is the term that refers to the concept of diving people into populations or groups on the basic of various sets of physical characteristics. a ethnic groups or b race

In a scientific experiment, a is any factor that can be changed or be changed

In which area will soil formation be greatest? a a steep slope in a warm,b wet climate a flat area in a warm,c wet climate a north-facing area on a steep slope a flat area in a cold, d wet climate description

b) is there any ordinal sense to zip codes? in other words, does a larger zip code tell you anything about a location compared to a smaller zip code?