Sometimes two or more drugs are so similar in their actions on the brain and the body that as people build a tolerance for one drug, they are simultaneously developing a tolerance for the other. this is known as:

tissue

explanation:

it is actually formed by geoup of cells which is tissue

one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.