Stress increases the release of cortisol, and the cortisol people cope with the stress. if stress continues for prolonged periods of time :

Stress increases the release of cortisol, and the cortisol helps people cope with the stress. If stress continues for prolonged periods of time: the increased cortisol begins to have adverse effects on bodily and mental functioning.  Increased activity in the dopamine reward systems, the same systems involved in drug addiction. 

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.

i dont know it at allnow im just getting points at this pint