According of Darwin, the organic evolution is due to

Options

A. Competition within closely related species
B. Reduced feeding efficiency in one species due to the presence of inter- fering species
C. lntraspecific competition
D. lnterspecific competition

Explanation

**Step-by-Step Solution:**

1. **Understanding Darwin's Theory of Evolution**:
- Charles Darwin proposed the theory of evolution, which explains how species change over time through natural selection. This theory emphasizes the role of competition among species as a driving force for evolution.

2. **Identifying the Options**:
- The question provides several options related to the causes of organic evolution:
a) Competition within closely related species
b) Reduced feeding efficiency in one species due to the presence of interfering species
c) Intra-specific competition
d) Inter-specific competition

3. **Defining Key Terms**:
- **Intra-specific competition** refers to competition among individuals of the same species.
- **Inter-specific competition** refers to competition between individuals of different species, particularly those that are closely related.

4. **Analyzing the Options**:
- While intra-specific competition is important, Darwin emphasized the significance of inter-specific competition in driving evolution. This is because different species often compete for the same resources, which can lead to adaptations and changes over time.

5. **Conclusion**:
- Based on Darwin's theory, the correct answer is **d) Inter-specific competition**. This type of competition leads to natural selection and the evolution of species as they adapt to survive and thrive in their environments.