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.
Zebras that are under human care, however eat less than eighteen hours daily because they have most of their daily nutrient needs pre-assembled in a single pallet, unlike the wild ones that do have to roam about looking for what to eat. In all, zebras are quite sociable and their ability to eat and digest quite a large variety of grasses, shrubs, plants and even fruits makes them quite an interesting and easy animal to tame and feed.