Examlex
It costs twice as much to sell to a new customer than it does to sell to an existing one.
Temperature Gradient
The rate of temperature change in space, reflecting differences in temperature over a specified distance.
Diffusion Gradient
A variance in concentration that permits molecules to move passively from an area of higher concentration to an area of lower concentration.
Respiratory Membrane
The thin barrier in the lungs through which gas exchange between the air in the alveoli and the blood in the capillaries occurs.
Gas Exchange
The biological process through which gases (such as oxygen and carbon dioxide) are transferred between the blood and the external environment in the lungs.
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