Pathways break down fuels from the food you eat and the liquids you drink.

The digestive system is the pathway mostly responsible for breaking down the food and liquids we intake. The materials we ingest are processed through different organs and are slowly absorbed by the body through the process of digestion. Other supporting organs that contribute to this are the liver and the kidneys. 

In my own word cell technology can  lead to advances in the understanding of diseases mechanism and transmission because diseases is very bad

Ithink the answer is d.