Final answer:
Lipase is the enzyme group that breaks down fats within the digestive tract.
Step-by-step explanation:
The enzyme group that breaks down fats within the digestive tract is lipase. Lipase is produced in the pancreas and is responsible for breaking down fats into individual fatty acid molecules. Additionally, the process of lipid digestion in the small intestine is aided by another lipase enzyme from the pancreas and bile secreted by the liver. Bile emulsifies large globules of lipids into smaller micelles, which provide a larger surface area for lipase to act upon and break down.