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>
Living components in a river ecosystem would include all plants, all animals, all microorganisms. Every fish species, every arthropod species, every reptile and amphibian species, all the birds, etc.
Answer:
kidney
Explanation:
pancreas to regulate salt
Answer:
A
Explanation:
A sustainable resource is not available in very small amounts, so that eliminates B. A sustainable resource doesn't need to be renewed if treated properly, so that ousts C, and it is not unlimited.
Answer:
Because food kept at room temperature is somewhat exposed to air, and sometimes, the air can contain dangerous chemicals that were perhaps accidentally released, whereas food in the refrigerator doesn't apply to that problem.
Explanation:
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