Examlex
The 2009 our imports and exports added together are __________ percent of GDP.
Tissues
Groups of cells within an organism that work together to perform a specific function.
Oxygen Concentration
The amount of oxygen present in a given environment, often measured in terms of percentage or partial pressure.
Residual Volume
The volume of air that remains in the lungs at the end of a normal exhalation.
Tidal Volume
The volume of air moved into and out of the lungs with each normal resting breath.
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