What is a gradient? a. more of something exists in one area than another and the two areas are connected b. maintenance of a relatively stable internal environment c. equal amounts of something exist...

What is a gradient?

a. more of something exists in one area than another and the two areas are connected

b. maintenance of a relatively stable internal environment

c. equal amounts of something exist in areas that are connected

d. equilibrium or balance between two unconnected areas