What is the method of silviculture in which almost all of the trees are harvested in one cutting, leaving only a few uniformly distributed mature trees to regenerate the stand?

seed-tree method or seed-tree cutting

Explanation:

The seed tree method is a modified method of clear cutting where trees which are seen to be the best are left behind so that they can regenerate and become parent trees to the new forest.

When everything else is cut off 8 to 10 trees which shows to be perfectly healthy and matured are left behind for regeneration.

These are wind resistant trees with light seeds like maple trees. After the new trees have grown they may be cutt off or be left for the two age stand.

the answer is b, encourage free trade

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