Millipedes primarily feed on what type of material?

Millipedes primarily feed on decaying organic material, which is crucial for their role in the ecosystem. This feeding behavior involves breaking down leaf litter, decomposing plant material, and other organic matter. By consuming decayed plant matter, millipedes contribute to nutrient cycling in the soil, enriching it and promoting plant growth. Their affinity for decomposing material is what makes option B the correct choice, as it aligns with their ecological role and dietary preferences.

Other options do not represent the primary diet of millipedes. For instance, fresh fruits, wood shavings, and plastic waste are not suitable or preferred food sources for these organisms. Millipedes do not consume fresh plant matter (like fruits) in significant quantities as it is less nutritious compared to decaying organic matter. Additionally, while they may encounter wood in their habitat, they do not eat wood shavings. Plastic waste is a non-organic material that millipedes cannot degrade or utilize for sustenance. Thus, the correct understanding of millipedes' diets highlights their dependence on decaying organic substances.