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.
You can normally help reduce the symptoms of a black eye. Gently apply an ice pack to the skin around your eye as soon as possible after the injury. You can use a bag of frozen peas wrapped in a tea towel. The cold will numb the pain and relieve the swelling. During the first day, you should apply the ice pack to your eye for 15-20 minutes an hour every hour. Painkillers, such as paracetamol or ibuprofen, can be used to help relieve pain.