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.
Wild zebras tend to eat mostly long, flowering grasses, like the Red Grass. This is one of the most dominant types of grass in the savanna, so there is plenty of it to go around. Zebras also like to eat common finger and Bermuda grass, which can be found along riverbeds. When theyâre available, beans and legumes are on the zebraâs menu. The wet season is a particularly great time for these animals because most of its food sources become plentiful.