I’m not sure about the first question but fossil fuels are like coal oil natural gases etc etc
Answer:
Did not understand your question
Explanation:
All I know is that:
Control variable is what you keep the same throughout all of the tests.
Dependant variable is what you observe from the test
Independent variable is what you are altering in the test
Answer:
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The substance that can not be broken down by chemical means is antimony.