Explain the significance of Lamarck's theory of evolution.

Explanation

### Step-by-Step Solution:

1. **Introduction to Lamarck's Theory**:
- Jean-Baptiste Lamarck was a French naturalist who proposed one of the earliest theories of evolution in the early 19th century. His theory is often referred to as Lamarckism.

2. **Key Concepts of Lamarck's Theory**:
- Lamarck suggested that organisms can acquire traits during their lifetime based on their needs and activities. For example, he believed that if an organism used a particular part of its body more, that part would become stronger or more developed.

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