Anormal red blood cell count is ; of the sexes, generally have greater numbers. a normal red blood cell count is ; of the sexes, generally have greater numbers. 2 to 3 million/mm2 of blood; men 4 to 6 million/mm2 of blood; women 4 to 6 million/mm2 of blood; men 2 to 3 million/mm2 of blood; women

The correct answer is a normal blood count is 4 to 6 million per millimeter square of blood, and of the sexes, the male generally has greater numbers.  

Blood count refers to the prediction of the number of corpuscles in a particular volume of blood. The normal range of red blood count in men is about 4.7 to 6.1 million cells per microliter. On the other hand, the normal range in women ranges from 4.2 to 5.4 million cells per microliter, according to the National Institute of Health data.  

It is probably E because when an endotherms core temperature is rising it needs to do something to reduce it body temp like sweating. Bringing more blood to the surface of the skin could potentially allow for more evaporation of liquids to lower the temperature.