Which arthropods contribute to the decomposition of guano?

The correct choice highlights the role of bugs, particularly some species within this category that play a crucial part in the decomposition process of guano. Bugs, which can include various insects and arthropods, often feed on organic matter, including decaying animal waste like guano. Through their feeding activities, they help to break down this material, facilitating the process of decomposition.

In the case of guano, it is often rich in nutrients and can attract a wide array of detritivores and scavengers, including several kinds of bugs. As they consume the guano, they contribute to nutrient cycling and help to aerate the soil, promoting plant growth. Their waste also serves as a nutrient source for other organisms within the ecosystem.

While ants, beetles, and flies all have their roles in the overall decomposition process, the context of the question is specifically looking at the contributions made by bugs. Thus, selecting bugs as the answer emphasizes the importance of this group in the environmental recycling of guano and its integration back into the ecosystem.