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Increasing returns occur when
Heartwood
The dense inner part of a tree trunk, yielding the hardest timber, providing strength, and often darker than the surrounding sapwood.
Vessels
Hollow tubes that carry fluids such as blood, lymph, or sap within an organism, including arteries, veins, and capillaries.
Mycorrhizae
Symbiotic associations between the roots of plants and a fungus, enhancing nutrient and water uptake for the plant and providing carbohydrates for the fungus.
Atmospheric Nitrogen
The form of nitrogen gas (N2) that makes up about 78% of the Earth's atmosphere, largely inert and not directly usable by most organisms.
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