The type of scientist who studies the relationships of all living things in a community is an ecologist.

Here's why:

* Ecology is the branch of biology that studies how organisms interact with each other and their environment.

* Communities are groups of different populations of organisms living and interacting in the same area.

* Ecologists investigate how these communities function, including:

* Food webs: How energy flows through the community.

* Competition: How organisms compete for resources.

* Predation: How predators and prey interact.

* Symbiosis: How organisms live together in mutually beneficial, harmful, or neutral relationships.

So, ecologists are the scientists who specialize in understanding the complex web of life within a community.