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Fisher argues that only very few types of communication are either purely descriptive or didactic.
Hemoglobin
A protein in red blood cells that carries oxygen from the lungs to the rest of the body and returns carbon dioxide from the body to the lungs.
Diffuse
To spread or scatter widely or thinly, often referring to particles, light, or substances mixing with another substance without any clear boundary.
Alveoli
Tiny sacs within the lungs where the exchange of oxygen and carbon dioxide takes place.
Capillaries
The smallest blood vessels in the body, responsible for the exchange of oxygen, carbon dioxide, and nutrients with tissues.
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