A species was defined as a population of interbreeding inviduals and reproductively isolated from other populations by

Options

A. charless Darwin
B. J.B. Lamarck
C. Carolus Linnaeous
D. Ernst Mayr

Answer

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

1. **Understanding the Question**: The question asks about the definition of a species as a population of interbreeding individuals that are reproductively isolated from other populations.

2. **Identifying Key Terms**: The key terms in the question are "interbreeding individuals" and "reproductively isolated." This indicates that a species is defined not only by its ability to breed within its own group but also by its separation from other groups.

3. **Historical Context**: The concept of species has been discussed by various scientists throughout history. However, the specific definition mentioned in the question is attributed to a particular scientist.

4. **Evaluating the Options**:
- **Charles Darwin**: Known for his theory of natural selection, not specifically for defining species.
- **J.B. Lamarck**: Known for his theory of inheritance of acquired characteristics, not for defining species.
- **Carolus Linnaeus**: Credited with developing the binomial nomenclature system for naming species, not for defining them.
- **Ernst Mayr**: Proposed the biological species concept in 1940, which aligns perfectly with the definition given in the question.

5. **Conclusion**: Based on the evaluation of the options, the correct answer is **Ernst Mayr**, as he defined a species as a population of interbreeding individuals that are reproductively isolated from other populations.

**Final Answer**: Ernst Mayr

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