Name the naturalist who put forward the theory of natural selection along with Darwin.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the name of the naturalist who contributed to the theory of natural selection alongside Charles Darwin.

2. **Recalling the Theory of Natural Selection**: Natural selection is a biological process where organisms better adapted to their environment tend to survive and produce more offspring. This concept is crucial to understanding evolution.

3. **Identifying Key Contributors**: While Charles Darwin is widely known for his work on natural selection, it is important to recognize that he was not the only scientist involved in this theory.

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