It is extremely useful for geologists, because most specimens of a given mineral are very close to the same hardness. ... So, we can conclude that not all the rocks are hard, and the hardness of rocks depends on how the atoms of the rock's minerals are bound to each other and how they are arranged.
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Protection from infection known as species resistance is a result of both the absence of necessary receptors and lack of suitable environment in the body.
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I can’t see the answer choices. I would like to guess that it would either be natural selection, or something to do with limited natural recourses.
Brainliest? I’m trying to rank up. Thank you sooo much.