Answer:
A. Disease
Explanation:
Specifically heart disease
Brightness is an attribute of visual perception in which a source appears to be radiating or reflecting light.In other words, brightness is the perception elicited by the luminance of a visual target. This is a subjective attribute/property of an object being observed and one of the color appearance parameters of color appearance models.
Some minor affects containing ephedrine is tremors, palpitations, headache, restlessness, anxiety, and insomnia.
Answer:
b cirulatory system that's the answer