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.
However, there are three types of zebras,  such as mountain, Grevy, and common â¦ zebra species. These different  species may eat different types of grasses. For example, Grevy  zebras can eat coarse grasses and bark when grass is scarce. A  mountain zebra can eat tufted grass.Zebras also eat other foods  when grass sources are scarce, and these include roots, shrubs, and  even fruit.owever, there are three types of zebras,  such as mountain, Grevy, and common â¦ zebra species. These different  species may eat different types of grasses. For example, Grevy  zebras can eat coarse grasses and bark when grass is scarce. A  mountain zebra can eat tufted grass.