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The testes can only produce functional semen at a certain temperature. If they were in the abdomen, the environment would be too warm. Since the scrotum is only a thin piece of skin, the testes are contained in an environment that is the perfect temperature.
They are genes.
Alveoli
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.