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.
Where Do Zebras Live. Few zebra species have superior habitats in comparison to others. Plains zebra is one of them. These species are akin to live in wide country grasslands, African savannahs and African trees. Even though seldom, these zebras are also known to reside at an elevation of about 13,000 feet (4,000 m).These animals tend to stay away from deserts or dense forests.ebras Grazing. Unlike plains zebras, mountain zebras do not apt to live beyond an elevation of 6,500 feet (2,000 m) above sea level. Rather they prefer to live at the mountainous slopes of South Africa. With their naturist ability to migrate, these animals do not preferably reside at one place.