Examlex
A purchase requisition is a legal contract between you and the supplier.
Carbon Dioxide
A colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.04% by volume) and is absorbed by plants in photosynthesis.
Concentration Gradient
The gradual difference in the concentration of solutes in a solution between two regions, often resulting in diffusion.
Gas Exchange
Gas exchange is the biological process through which organisms exchange oxygen and carbon dioxide with their surroundings, critical for respiration.
Diffusion
The passive movement of molecules or particles from an area of higher concentration to an area of lower concentration, a process fundamental to many biological systems.
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