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.
If blood collects under the tissues, and reaches a centimeter or more in diameter, the area is now referred to as a purpura. An even larger area is called an ecchymosis (known as the common bruise). However, petechiae represent bleeding into the skin or mucous membranes and may be due to a cause that is reversible. Thus if you or your child have any petechiae, you should seek your local health professional, to see if there are any reversible causes.