Final answer:
A coral reef is a community with high biodiversity due to its diverse array of fish, corals, and mollusks.
Step-by-step explanation:
The ecosystem that represents a community with high biodiversity is a coral reef. A coral reef is a marine ecosystem that is home to a diverse array of fish, corals, and mollusks. The variety of species in a coral reef demonstrates high biodiversity, making it an important and ecologically rich community.