With all the leaves falling each year, a natural compost keeps the soil healthy for all the trees where?\nOptions:\n- garden\n- useful for recycling\n- surface of earth\n- forest\n- orchard
Step-by-step reasoning:
forest
A natural compost keeps the soil healthy for all the trees in a forest which is a large area covered chiefly with trees.

Compost is decayed or decaying organic matter like leaves.

.

Therefore, the answer is forest