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Hemoglobin is the compound in red blood cells that carries oxygen to the body. the distribution of hemoglobin in women in g/dl of blood is approximately normally distributed with mean 14 and standard deviation 1. too little hemoglobin, and you're anemic. 2. too much, and (unless you live at high altitudes), you can have other problems.

Ais a group of individuals of the same that exist together in the same place at the same time

This is the interaction of two organisms where one is and the other is neither nor harmed.