application or intradermal injection of a substance to the skin to test the body's reaction to it. Such a test detects an animal's sensitivity to such allergens as dust and pollen, or to preparations of microorganisms believed to be the cause of a disorder.
A direct relationship graph is a graph where one variable either increases or decreases along with the other. The general equation for a direct relationship graph is y = mx + b, where y denotes the...
Direct proportional graph is very distinctive. In direct proportionality, graph will a straight line that passes through the origin and its slope is the constant of proportionality. If there is a straight line means the two physical quantities has positive relationships as the slope is positive.