The long-ago deposited plant and animal remains, now buried, have been compacted and transformed into coal and oil. the use of these fossil fuels has both positive and negative consequences. all but one is a negative consequence of using fossil fuels.a)contributes to acid rainc)requirement for photosynthesisb)contributes to global warmingd)formation of carbonic acid in the atmosphere

The answer is C requirement for photosynthesis for USATestprep :)

The answer is D i'm pretty sure because it dose contribute to acid rain, and it makes co2 needed for photosynthesis, and finally it does contribute to global warming.

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Scientists use sampling to get an estimate of things they can't easily count. Scientists keep track of the change (increase or decrease) of population numbers to make decisions about issues that affect that population.