Ethology deals with the study of

Options

A. Behaviour of animals
B. Past life of organism
C. Disease causing pathogens
D. None of these

Answer

**Step-by-Step Solution:**

1. **Understanding Ethology**: Ethology is defined as the scientific study of animal behavior. It focuses on how animals interact with each other and their environment.

2. **Analyzing the Options**:
- **Option A**: Behavior of animals - This aligns with the definition of ethology.
- **Option B**: Past life of the organism - This is related to paleontology, which studies fossils and ancient life forms.
- **Option C**: Disease-causing pathogens - This pertains to microbiology, which studies microorganisms that cause diseases.
- **Option D**: None of these - This option implies that none of the previous options are correct.

3. **Identifying the Correct Answer**: Since ethology specifically deals with the behavior of animals, the correct answer is **Option A**: Behavior of animals.

4. **Conclusion**: Ethology is primarily concerned with understanding the behavior of animals in their natural environments.

**Final Answer**: Ethology deals with the study of the behavior of animals.

---