Functional explanation is an approach in the philosophy of science that seeks to explain phenomena by understanding their purpose or function. It focuses on how something operates as part of a larger system to achieve certain objectives, rather than simply describing how it works. Functional explanations are often used in biology and evolutionary theory to understand the adaptive significance of traits or behaviors.

To eat leaves off of trees.

Found a nice explanation here:

http://www.e-consultancy.com/knowledge/glossary/1163/partial-functional-dependency.html In database terminology, a partial functional dependency occurs when the value in a non-key attribute of a table is dependent on the value of some part of the table's primary key (but not all of it).

Explanation: The Deoxyribonucleic acid contains information that instructs the cells to combine together to form a heart. The basic structural and functional unit of life is cell

non functional enzyme