Where do leeches typically dwell?

Leeches are primarily found in environments that provide them with adequate moisture and access to food sources, which often include detritus and small aquatic animals. The lake bottom, where they can hide among twigs and leaves, offers a suitable habitat because it provides both shelter and food. This environment allows leeches to thrive, as they can easily attach to passing prey and maintain their moisture needs.

In contrast, while leeches can occasionally be found in other areas like open water or along shorelines, these habitats do not offer the same level of shelter and food availability as the lake bottom does. Rocks in shallow water may be too exposed for them, and open water areas may not provide the necessary nutrition or refuge. Likewise, moist sand along the shore, while it can support some aquatic life, typically lacks the structural complexities that leeches prefer for feeding and hiding. Thus, the association of leeches with twigs and leaves at the lake bottom is the correct choice, reflecting their behavior and ecological needs.