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.
Report Abuse. Your iris (the colored part of your eyes) CONTRACTS and makes the pupil smaller. This is because the increased light could damage your pupil. The pupil gets smaller. The reverse happens when you go into a dark room. You never lose any sight in the process. To test this out, go into a small room and keep flipping the light switch. Watch your pupils.