(B) In Australian acacia $(Acacia \text{ } auriculiformis)$, the leaves are small and short-lived. To minimize water loss through transpiration, the p

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(B) In Australian acacia $(Acacia \text{ } auriculiformis)$, the leaves are small and short-lived. To minimize water loss through transpiration, the petiole expands, becomes green, and synthesizes food. This modified, flattened, and photosynthetic petiole is known as a phyllode.