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Draw a correct Lewis structure for acetaldehyde, CH3CHO.
Proximal Stimulus
The stimulus registered by the sensory receptors, for example, the pattern of light that hits the retina.
Immune System
The body's defense mechanism against pathogens, comprising various organs, tissues, and cells.
Grass Pollen
Microscopic grains released by grasses for the purpose of fertilization, often a common allergen for many people.
Allergen
A substance that can cause an allergic reaction in individuals who are sensitive to it, ranging from mild to severe responses.
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