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.
Look for other diseases or deficiencies. Petechiae can also be caused by other diseases, such as leukemia. It can also be the result of a vitamin c deficiency (also known as scurvy) or a vitamin k deficiency. 1  It's worth noting that some treatments, such as chemotherapy, can also result in petechiae.