What do you mean by "ontogeny repeats phylogeny?"

Explanation

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Ontogeny** refers to the development of an individual organism from the fertilized egg to its mature form.
- **Phylogeny** refers to the evolutionary history and relationships among species or groups of organisms.

2. **Recapitulation Theory**:
- The phrase "ontogeny repeats phylogeny" is associated with the recapitulation theory, which was proposed by the German zoologist Ernst Haeckel.
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