The diagram illustrates the production process of a biofuel called ethanol.

Initially, plants and trees absorb energy from sunlight and carbon dioxide to grow. Once

mature, these plants are harvested and subjected to pre-processing, which involves the breakdown

of cellulose. This step generates carbon dioxide as a byproduct.

Next, the cellulose is processed to produce sugars. Microbes are then added to these sugars, facilitating

fermentation to create ethanol. It is then used as a biofuel for various means of transportation,

including cars, trucks, and aeroplanes, all of which emit carbon dioxide when it is burned.

The diagram highlights a cyclical process, as the carbon dioxide released during pre-processing

and the combustion of ethanol is reabsorbed by plants and trees, promoting their growth and

continuing the cycle.

In summary, ethanol production involves a series of steps from plant growth to the

fermentation of sugars, resulting in a biofuel that can power various modes of transportation while

maintaining a cyclical balance of carbon dioxide. (166 words)