Which of the following refined products is not made from crude oil? a. heating oil b. diesel and jet fuel c. gasoline d. biodiesel

The answer is letter d. Biodiesel. Biodiesel is made of natural products made from animal fats and vegetable oils meant to be used in typical diesel engines and is thus different from the vegetable and waste oils used to fuel converted diesel engines. While the crude oil is a naturally occurring flammable liquid containing complex mixtures of hydrocarbons and other organic compounds.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.