Question

Second, using current technology, biofuels take more energy than they give! In a study reported in 2005, researchers studied various biofuels. They calculated the ratio of energy inputs to output. Inputs are what it takes to produce the biofuel, such as the energy to run tractors, trucks, and factories. Output is the energy users can get from the biofuel. This particular study showed that it takes 129 units of energy to produce enough ethanol to generate 100 units of energySelect the TWO approaches the author uses in paragraph 9 to explain the difference between energy inputs and output.


The author provides simple definitions.


The author describes the production process.


The author uses equipment as a contrast.


The author clarifies what energy units are.


The author references a 2005 study.

Answer 1

- The author provides simple definitions.
- The author references a 2005 study.