Which fossil fuel contributes 13 percent of the electricity in the United States? coal
oil
natural gas
methane

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Type the correct answer in the box. use numerals instead of words. fiona has a lovely flower bed in her yard. she wants to add a fence along one side of the flower bed. the fence material is sold in meters. fiona knows that her flower bed is 200 centimeters in length. how much fencing material does fiona need in meters? fiona needs meters of fencing material for her flower bed.

This is the interaction of two organisms where one is and the other is neither nor harmed.