Loamy soil is ideal for gardening because it contains select one: a. mostly silt with very little clay or sand. b. mostly clay with very little silt or sand. c. mostly sand with very little clay or silt. d. roughly equal parts sand, clay, and silt.

The answer is D. roughly equal parts sand, clay, and silt.
Sand is important because it provides necessary nutrients for the plants (both mineral and organic). Clay is important because it ensures that the plants are able to get proper oxidation, and Slit is important to ensure that the root of the plants anchored properly to the sand.

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The answer should be a.