the alveoli. without the billions of alveoli the lungs could not exchange CO2 for 02
This is a very generalized question. Different motor units have different important characteristics. An example being how an important characteristic of the motor unit of a vehicle is the intake manifold but the important characteristic of a game consoles motor is its gears.
Yes, radon is a very important cause of lung cancers for the non-smoking peoples.
The presence of scales in fish is a structural characteristic rather than a behavioral one. Scales serve various functions, such as protection against predators and parasites, reducing water resistance, and aiding in locomotion. This structural trait has evolved to support the fish's survival in aquatic environments.
is that they are all connsidered terresterial planets!
On a scale from one to ten one lung isn't vital, important, since you can survive on one but you can't live without one, so I suppose a ten.
can fly plane with one lung
The most important one is fertility. Second most important is mothering ability; third, milking ability.
They are involuntary i.e. they are not able to be consciously controlled.
they all have at least one electron
One structural feature that is not important on the surface membrane of an animal cell is the presence of a cell wall. Animal cells lack a cell wall, unlike plant cells which have a rigid cell wall for structural support and protection.
One
People can live with one lung or one kidney.