几千年来，他们开始减少对野外狩猎和采集的依赖，而更多地依靠自己饲养的动物和播种的庄稼。
Over thousands of years, they began to depend less on what could be hunted or gathered from the wild, and more on animals they had raised and crops they had sown.
另一个例子就是巨型动物和本地植物群的相互联系，尤其是那些仅依赖动物传播种子的植物。
Another example is the interaction of megafauna with local flora, in particular, plants that rely on animals to disperse their seeds.
一些动物帮助植物传播种子。
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