A measure of the number of particles of a substance in a given volume would be concentration. <span>In chemistry, </span>concentration<span> is the abundance of a constituent divided by the total volume of a mixture. There are a number of ways expressing it such as molarity, molality, normality, ppm, percentage and the like.</span>
Organization is important because the structure denotes the function in biology, therefore organization in this case means that it has a high relevance for homeostasis. If something is not organized, it's not in homeostasis, it's as simple as that.
