Peter took a selfie in his room. He was a wearing a light blue shirt. But he failed to realize that that shirt would clash in color with the light blue walls in his room. He wants to edit this photo using editing software. Which tool can Peter use to darken the background in his photo?

A wand tool is to do that in an editing software.

professionals can use many types of technology that can them. some examples are, computers (they research and can use for programs for data, they are also used for job applications, school work, and even to make new ideas), speedometers (can get data for unknown data), sometimes something as small as a pen (used for rough drafts, to insert data, and again job applications).