The following graphs indicate which type of cost behaviour? 
Definitions:
Sclerenchyma
A type of plant tissue known for its thick, lignified cell walls, which provide structural support.
Fibers
Indigestible plant substances consisting mostly of cellulose, aiding in digestion and bowel health.
Sclereids
Thick-walled, often branched cells found in plants that provide support and deter herbivory.
Guard Cells
Pairs of cells surrounding stomata in plant leaves and stems, regulating gas exchange and water loss by controlling the opening and closing of stomata.
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