Final answer:
Ecosystem diversity best describes the collection of locations mentioned (a forest, a freshwater lake, an estuary, and a prairie).
Step-by-step explanation:
Ecosystem diversity, which refers to the variety of ecosystems on Earth, best describes the collection of locations mentioned (a forest, a freshwater lake, an estuary, and a prairie). Ecosystems are formed by populations of different species interacting with each other and their environment. The presence of these diverse ecosystems indicates the existence of different habitats and interactions between species, contributing to overall biodiversity.