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Final answer:Compacted soilin a garden harms plants by decreasing aeration and infiltration, leading toincreased water runoff. This prevents air and water from reaching plant roots, necessary for their growth and survival. Factors contributing to soil compaction could includeliving organisms, humidity levels, and climate.Option a.Explanation:Thecompaction of soilin a garden harms plants bydecreasing aeration, decreasing infiltration, and increasing runoffoption a.. In simpler terms, this means that compacted soil makes it difficult for air and water to penetrate the soil and reach the plant roots. This lack of aeration and infiltration leads to an increase in water runoff, which can also erode the soil. A few factors that affect soil compaction include presence of living organisms such asprairie dogsthat can reduce soil aeration, humidity levels that can affect evaporation rates, and climatic factors such as warmer temperatures that can alter the growing season of plants. Furthermore, overuse of nitrogen fertilizers could lead to microbial overgrowth, depleting oxygen in the soil and harming the fauna.Learn more about Soil Compaction here:brainly.com/question/22957255#SPJ11...