Explain what happens during old feild succession​

If undisturbed, an open field over time will be invaded by shrubs, which in turn will be replaced by saplings, young trees, and eventually a mature forest. Foresters often refer to these phases as the grass and forbs stage, shrub and sapling stage, pole stage, and mature forest.

Explanation:

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x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects