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.  

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.