A dead tree is home to many organisms, including fungi, insects, and some small animals. This is an example of a(n)

ecological niche. The dead tree provides a habitat and resources for various organisms, and each species has a unique role or function within the ecosystem. The fungi break down the wood, insects feed on the fungi and wood, and small animals may feed on the insects or use the tree for shelter. This illustrates how different species can interact and depend on each other within an ecosystem.