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The distribution of food-plants—both potential and actually exploited — reflects the natural history of contact across the seas and through the region, often long before Pleistocene times. The later and the human contribution has to be discerned from varied lines of evidence. The inventive process of early domestication leading to cultivation in the Sahulian north (New Guinea) was not a part of plant adaptation in the south (Australia). Neither did species diffusion result in adoption of agriculture or stimulation towards domestication among the Aboriginal hunter-gatherers.

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