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, ...).
Answers (4) 1  It is normal for the yes go black after death. Usually, the eyes contain blood vessels. 2  Yes, I agree. This is kind horrible to answer. 3  The change in eye colour that you can see in the eyes of dead people is due to opacity of the cornea, aqueous humour and lense brought about by lack of oxygen.