What is a tree line?

Explanation

### Step-by-Step Text Solution:

1. **Definition of Tree Line**:
The tree line refers to the boundary or edge of a habitat where trees are capable of growing. It marks the limit beyond which trees cannot survive due to environmental conditions.

2. **Characteristics of Tree Line**:
- The tree line is the point where the conditions become unfavorable for tree growth.
- It indicates the transition from areas where trees thrive to areas where they cannot grow.
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