Define macroevolution.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Macroevolution**: Macroevolution refers to large-scale evolutionary changes that occur over extended periods of time, resulting in the emergence of new species or significant changes in existing species.

2. **Evolution Between Species**: Macroevolution involves the evolution that occurs between different species. For example, if a species like a cat undergoes macroevolution, it may evolve into a completely different species that has distinct characteristics and traits.

3. **Time Scale**: Macroevolution occurs over a long time scale, often taking millions to billions of years. This extended time frame is necessary for significant evolutionary changes to manifest.

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