Broad categories of ecosystems are called __________

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term used to describe broad categories of ecosystems.

2. **Identifying the Term**: The term that refers to these broad categories is "biomes."

3. **Defining Biomes**: Biomes are large ecological areas on the Earth's surface, with flora and fauna (plants and animals) adapting to their environment. Examples include deserts, forests, grasslands, and tundras.

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