Thus, altruism is costly to self, but is a beneÃt to others. In other words, the cost of altruism is described exclusively. in terms of changes in Ãtness for a focal individual and the. beneÃt of altruism is described exclusively in terms of the. changes in Ãtness of the complement of the focal individual.
Petechiae on the face and conjunctiva (eyes) can be a sign of a death by asphyxiation, particularly when involving reduced venous return from the head (such as in strangulation). Petechiae are thought to result from an increase of pressure in the veins of the head and hypoxic damage to endothelia of blood vessels.
Petechiae causes. Petechiae may be caused due to a number of reasons. Some of the potential causes of petechiae are listed below: Most cases of petechiae spots generally arise due to injury or trauma to the skin. Injury to the capillaries present under the surface of the skin can result in a hemorrhage.