Problemas
Fossil fuel A natural substance formed from the __ remains of ancient organisms that can be used as a source of __ Ex. Coal, oil, gas
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Respuesta
'Fossil fuels'
Explicación
## Step 1The problem is asking for the type of substance that is formed from the remains of ancient organisms and can be used as a source of energy. The options provided are coal, oil, and gas.## Step 2All these options are examples of fossil fuels. Fossil fuels are formed from the remains of ancient organisms that have been subjected to heat and pressure over millions of years.## Step 3These fuels are called "fossil" fuels because they are formed from the fossilized remains of dead organisms. They are considered non-renewable resources because they take millions of years to form, and reserves are being depleted much faster than new ones are being made.