These genetic variants are believed to cause changes in the way the bodyâs T cells behave. T cells are immune system cells that normally fight off harmful invaders, such as viruses and bacteria. In people with psoriasis, however, T cells also attack healthy skin cells by mistake. This immune system response results in a range of reactions, including: 1  enlargement of blood vessels in the skin.  increase in white blood cells that stimulate the skin to produce new cells more quickly than usual.
Teeth. Zebra have several types of teeth that help them survive in their habitats. In the front of their mouths, zebra use their strong incisors for biting off grass and other vegetation. In the rear of their mouths, zebra have molars and premolars to grind down their food.
Grevyâs zebras, which live in shrubland and grassland, live in Northern African countries-Kenya and Ethiopia. Interesting things about zebras. 1  Zebras eat a lot of grass. 2  They graze throughout the day. 3  The average height of a fully grown zebra is 1.25-1.5 meters (4-5 feet).4  Grevyâs zebras and Mountain zebras are both listed as endangered species.ebras live in africa and they are always in a large wild herd sometimes they are in the mountains they have a really good eyesight and good hearing so thats how they know when the predators are coming to kill them. March 12, 2010 at 6:27 pm. this is amazing info! April 13, 2010 at 4:25 pm.