Define natural selection.

Explanation

**Step-by-Step Text Solution:**

1. **Introduction to Natural Selection**: Natural selection is a fundamental concept in evolutionary biology, first articulated by Charles Darwin. It describes the process through which certain traits become more or less common in a population based on the survival and reproductive success of individuals.

2. **Adaptation to Environment**: According to Darwin, organisms that are better adapted to their environment are more likely to survive and reproduce. This means that the traits that enhance survival and reproduction will be passed on to future generations.

3. **Survival of the Fittest**: The phrase "survival of the fittest" is often associated with natural selection. It refers to the idea that individuals with advantageous traits are more likely to survive challenges (such as natural disasters or diseases) and thus have a higher chance of reproducing.

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