A bio-oil is any form of automotive oil which is synthesized, as
opposed to petroleum-based.
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bio fuel consist of waste bio degradable material like paper,
vegetables, cow dung, leaves, eatables, these things are decomposed
in a container which leads to formation of gases that can be used
as bio fuel .
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Bio fuels are those fuels that are easier on the environment
than petroleum-based fuels. Some examples are bio diesel and
methane.