Matural selection is based on what? \( \square \quad \) Change \( \quad \begin{array}{l}\text { Similarities } \\ \text { Stable Environment }\end{array} \) \( \square \)

Natural selection is based on the concept of change within populations over time, specifically how certain traits become more or less common due to their impact on the survival and reproduction of organisms. Here's a breakdown of the key components: 1. **Variation**: Individuals within a population exhibit variations in traits (e.g., size, color, speed). 2. **Competition**: Resources are limited, leading to competition among individuals for survival. 3. **Survival of the Fittest**: Individuals with traits that provide an advantage in their environment are more likely to survive and reproduce. 4. **Inheritance**: Favorable traits are passed on to the next generation, leading to gradual changes in the population over time. Thus, the correct answer to what natural selection is based on is: - \( \square \) Change The other options, such as "Similarities" and "Stable Environment," do not directly capture the essence of natural selection, which is fundamentally about change and adaptation in response to environmental pressures.