Which of these is a cost of using fossil fuels?
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a. they create jobs for many people worldwide.
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b. they are used to heat homes and generate electricity.
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c. they are used to make plastics and synthetic materials.
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d. they produce pollutants that harm people.

Astudent sees several ants walking up a wall following the exact same trail that an ant took earlier. she wants to apply the scientific method to determine how the ants detected the trail. which of these steps would come first in her application of the scientific method? perform an experiment by cleaning the scent away from part of the trail. draw a conclusion that the ants follow a scent trail. make a prediction about what the ants will do after she cleans away part of the trail. hypothesize that the ants are following a scent trail that the first ant left.