Question

_________ is an alternative fuel that can be made from any fat or vegetable oil. it can be used in any diesel engine with few or no modifications. although it does not contain petroleum, it can be blended with diesel at any level or used in its pure form.

Answer 1

I believe the answer is: Biodiesel
The word 'bio' in biodiesel is given because this diesel fuel is created from the fat of living organism (vegetable oil, soybean oil, animal fat).
Biodiesel tend to produce less gas emissions compared to normal fossil fuel which make it better for the environment.