Q6 of 45 Page 544

Why are the coal, petroleum and natural gas called fossil fuels?

Coal, Oil and Gas are called "fossil fuels" because they have been formed from the remains of the plants and animals that had fossilized million years ago.


Fossil fuels are a non-renewable energy source since they take millions of years to form.


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When does anaerobic respiration occurs in our body? Give an example.