Ontario Grade 9 Science Class Practice Exam 2025 – Your Complete Guide to Exam Success!

A biome is characterized as a large ecological area that encompasses specific climatic conditions and distinct communities of plants and animals. This definition emphasizes the expansive nature of biomes, which span vast geographic regions and are shaped by various environmental factors such as temperature, precipitation, and soil type. Each biome supports a unique set of organisms that have adapted to thrive in those specific conditions.

In contrast, other statements either restrict the scale or misunderstanding of what constitutes a biome. For instance, describing a biome as a small, controlled environment with similar organisms limits its scope substantially. Additionally, while temperature and elevation are important factors influencing ecosystems, a biome is defined by a wider array of criteria including climate, vegetation, and animal life. Lastly, describing a biome as a temporary ecosystem contradicts the longevity and stability often associated with these large-scale environments, which can remain in place for extended periods, albeit with some seasonal changes.