Which term means potent chemical regulators that have many effects throughout the body, including many aspects of fever and pain as well as the symptoms of severe menstrual cramps

prostaglandins

Explanation:

Prostaglandins are eicosanoids (i.e. lipids) derived from arachidonic acid and related fatty acids. Prostaglandins are synthesized by many tissues in the body when they are damaged or infected in order to deal with such injuries/infections. They are hormone-like compounds involved in pain and inflammation. It is well known that the levels of prostaglandins change in the menstrual cycle of women, producing vasoconstriction of the endometrial vessels during menstruation and contraction of the muscles in the myometrium. High prostaglandin levels are characteristic of severe menstrual cramps.

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.