Answer:
Minerals can be identified by their physical characteristics. The physical properties of minerals are related to their chemical composition and bonding. Some characteristics, such as a mineral's hardness, are more useful for mineral identification.
Explanation:
Mitochondria. The mitochondria has a variety of different functions and is therefore essential for the cell's productivity.
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because a cold is a virus and not a bacteria.
Answer:
Possible environmental contamination.
Explanation: