Examlex
Unix is often found with a text-based interface,although graphical user interfaces are available.
Active Transport
A cell's energy-consuming process to move substances across a cell membrane against a concentration gradient.
Diffusion
The movement of molecules from an area of higher concentration to one of lower concentration until equilibrium is reached.
Concentration
Concentration refers to the amount of a substance in a defined space or volume, commonly used in chemistry to denote how much solute is dissolved in a solvent.
Alveoli
Tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place during breathing.
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