An important evidence in favour of organic evolution is the occurrence of `:`

Options

A. Homologous and vestigial organs
B. Analogous and vestigial organs
C. Homologous organs only
D. Homologous are analogous organs.

Answer

**Step-by-Step Solution:**

1. **Understanding Organic Evolution**: Organic evolution refers to the gradual development of life forms from simpler to more complex forms over time. It is supported by various types of evidence.

2. **Identifying Types of Evidence**: Among the various types of evidence for organic evolution, two significant categories are homologous organs and vestigial organs.

3. **Defining Homologous Organs**: Homologous organs are those that have a similar structure and origin but may serve different functions in different organisms. For example, the forelimbs of humans, whales, and bats have different functions (manipulation, swimming, and flying, respectively) but share a common structural framework.

4. **Defining Vestigial Organs**: Vestigial organs are those that have lost their original function through the course of evolution. They are remnants of structures that were functional in ancestral species. An example is the human appendix, which is considered vestigial.

5. **Understanding Analogous Organs**: Analogous organs, in contrast, are those that serve similar functions but have different origins. For example, the wings of insects and birds serve the same function (flight) but evolved independently.

6. **Conclusion**: The occurrence of homologous and vestigial organs provides important evidence for organic evolution. Therefore, the correct answer to the question is that an important evidence in favor of organic evolution is the occurrence of homologous and vestigial organs.

**Final Answer**: Homologous and vestigial organs.

---