Most convincing in Darwin's theory is

Options

A. Malthus essay
B. Population
C. Survival of the fittest
D. Formation of species

Explanation

### Step-by-Step Text Solution:

1. **Understanding Darwin's Theory**:
- Charles Darwin proposed the theory of evolution through natural selection. This theory explains how species evolve over time based on their ability to adapt to their environment.

2. **Key Concept - Survival of the Fittest**:
- One of the most convincing aspects of Darwin's theory is the concept of "survival of the fittest." This phrase means that individuals or species that are better adapted to their environment are more likely to survive and reproduce.

3. **Natural Selection Process**:
- Natural selection is the mechanism by which evolution occurs. It involves the following steps:
- Variation: Individuals within a species show variation in traits.
- Competition: Individuals compete for limited resources like food, shelter, and mates.
- Survival: Those with advantageous traits are more likely to survive and reproduce.
- Reproduction: The advantageous traits are passed on to the next generation.

4. **Role of Environmental Changes**:
- If an environment changes, species that cannot adapt may face extinction. Conversely, those that can adapt will thrive and continue to evolve.

5. **Malthus's Influence**:
- While Darwin's theory is often associated with Thomas Malthus, who discussed population growth and resource limitations, it is important to note that Darwin's key contribution was the mechanism of natural selection, not the concept of population growth itself.

6. **Conclusion**:
- The most convincing aspect of Darwin's theory is indeed the "survival of the fittest," which emphasizes the importance of adaptation and natural selection in the evolution of species.