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.
Introduction. A black eye is bruising to the tissue under the skin surrounding your eye. It's usually caused by a blow to the face, such as a punch, or an accident such as a fall.
A black eye can sometimes take as long as two weeks to heal completely, and a severe black eye can take even longer.Unless youâre planning to stay home for as long as it takes your black eye to heal (or to wear sun glasses everywhere you go), you may want to consider concealing it with makeup. black eye can sometimes take as long as two weeks to heal completely, and a severe black eye can take even longer.