Quartz also has a hardness level of 7.5, so rubbing another mineral with a 7.5 hardness on it will not effect the quartz.
Answer:
Light energy (sunlight)
By autotrophs
As they make food from it
Answer:
Sartorius and Stapedius muscle
Explanation:
Sartorius is the longest and stapedius is the thinnest
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The tundra has little variation in temperatures
