Ontario Grade 9 Science Class Practice Exam 2026 – Your Complete Guide to Exam Success!

Native species are organisms that have evolved and adapted to live in a specific geographic area over a long period. Their presence in the environment is intertwined with the local ecosystem, which includes the climate, soil, flora, and fauna of the area. This is referred to as their historical range, which is the area where they are naturally found and have developed relationships with other species and their habitat.

When native species exist within their historical range, they play key roles in maintaining the balance and health of the ecosystem. This relationship affects everything from nutrient cycling to predator-prey dynamics. Therefore, a species that is considered native thrives best in its natural environment, as it has adapted to the specific conditions present there.

In contrast, the other options do not accurately reflect where native species typically reside. Urban areas often disturb natural habitats, new ecosystems suggest environments where the species have not historically lived, and aquatic environments specify only one ecosystem type, not addressing the diverse habitats that can support native species.