Hear the different songs of three lacewing flies in this interactive activity. These songs are an example of a reproductive barrier that can lead to speciation; the differences among the songs determine mate choice and result in reproductive isolation between the different populations.Also included is a table summarizing the different kinds of isolating mechanisms.ear the different songs of three lacewing flies in this interactive activity. These songs are an example of a reproductive barrier that can lead to speciation; the differences among the songs determine mate choice and result in reproductive isolation between the different populations.
Sometimes, a black eye can occur after cosmetic surgery to the face, such as a facelift or a nose operation. The area around the eye turns bluish or purple because tiny blood vessels under the skin burst and blood leaks out into surrounding soft tissue.
When the eye is sunburn the white of the eye becomes blood shot, the eye feels gritty, and one becomes sensitive to light. Similar to skin sunburn, eye sunburn occurs when too many powerful UV rays hit your fragile cornea and it cannot immediately recover. Apart from being the outer layer of defense for your eye, protecting against dirt and sand, the cornea also shields more delicate parts of the eye from harmful UV light.