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, ...).
When light hits these, they are âdepolarisedâ, and have to be repolarised before they can be used again. So, when you close your eyes you can see an after-image of the light while they repolarise. If you move your eyes around, the image should move around with them, and fade after a few seconds.