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They are genes.
Alveoli
Because they are the lining of the lungs that begin the process of taking oxygen out of the air and into the blood stream. They are the parts that actually coe into contact with the "air" and are therefore called the functional part of the lungs.
Why are nephrons considered the structeral and functional units of the kidney?
Genes are the functional units of heredity.
One of the functional units of a myofibril is the sarcomere. The word sarcomere comes from the Greek words sarx, meaning flesh, and meros, meaning part.
The basic structural and functional units of organisms are cells.
Cell of living organisms!
cells are functional units
between functional units
One million functional units
I have no idea what you mean with "functional unit". The SI has units to measure lots of different things; basically there are seven base units (such as the meter, the second, and the kilogram), and several dozen derived units, i.e., units derived from the base units, for example meters/second for speed.