Answer:
Both the identity and the properties of a substance change
Explanation:
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The answer is A. Man-made
At the interface of two fluids, there is a difference in pressure. This leads to the existence of a surface force, the surface tension, that shapes the fluid.
The surface tension of water is roughly 72 dynes/cm,
However, that is highly dependant on the characteristics of the considered material (physical and chemical), and thus all fluids (and thus liquids) do not have the same surface tension.
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Genes are partly in chromosomes and partly in DNA.