Estimates of the cost of invasive species to the United States alone are in the tens of billions of dollars yearly. Annual federal expenditures on prevention and management of invasive species are estimated to exceed $1.3 billion.
Depending on what specific conditions are. Some of the color we see when we close our eyes is light that gets thru the eye lid. It usually has a red componenet to it because of the blood veins. Sone, especially right after closing our eyes is the various elements in our visual system settling down (rods, cones, ...).
Black is the darkest color, resulting from the absence or complete absorption of light. Like white and grey, it is an achromatic color, literally a color without hue. It is one of the four primary colors in the CMYK color model, along with cyan, yellow, and magenta, used in color printing to produce all the other colors. Black is often used to represent darkness; it is the symbolic opposite of white (or brightness).