The physical characteristics of minerals include traits which are used to identify and describe mineral species. These traits include color, streak, luster, density, hardness, cleavage, fracture, tenacity, and crystal habit.
I think it's pain receptors.
Answer
D if I’m not mistaken
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Crossing Over Occurs in Prophase I of Meiosis
It is where a piece of a non-sister chromatid exchange DNA with another Non-Sister to increase genetic diversity
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Explanation:
An index fossil is used for learning the age of geological periods.