Answer:
c
Explanation:
because matter is any substance that has mass and occupies space
You would expect a scratch on the quartz since quartz is on a hardness scale of 7 and the mineral you are rubbing against it is at a hardness scale of 7.5
Answer:
Explanation:
Ammonia is removed from an aquarium system through the use of a biofilter. The biofilter provides a substrate on which nitrifying bacteria grow. These nitrifying bacteria consume ammonia and produce nitrite, which is also toxic to fish. Other nitrifying bacteria in the biofilter consume nitrite and produce nitrate.
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