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◉ Science·1 min·Updated Mar 11, 2026

What is Natural Selection?

Natural Selection

Quick Answer

A process in which organisms better adapted to their environment tend to survive and produce more offspring. This concept is a key mechanism of evolution.

Overview

Natural selection is a fundamental concept in biology that explains how species evolve over time. It occurs when individuals with traits that are better suited to their environment have a higher chance of surviving and reproducing. Over generations, these advantageous traits become more common in the population, leading to gradual changes in the species. The process of natural selection involves several steps. First, there must be variation in traits among individuals in a population. For example, in a group of beetles, some may be green while others are brown. If the environment changes, such as the ground becoming darker, the brown beetles may be less visible to predators, allowing them to survive longer and reproduce more than the green ones. Natural selection matters because it helps explain the diversity of life on Earth. It shows how species adapt to their environments, leading to the emergence of new species over time. Understanding this process is crucial for fields like conservation biology, where scientists work to protect endangered species by understanding their adaptations and needs.

Frequently Asked Questions

The main components include variation, competition, and survival of the fittest. Variation refers to the differences in traits among individuals, competition occurs for resources, and survival of the fittest means those best adapted to their environment are more likely to survive and reproduce.
Natural selection leads to evolution by favoring traits that enhance survival and reproduction. Over many generations, these traits become more common in the population, resulting in changes to the species' characteristics.
Yes, natural selection can occur rapidly under certain conditions, such as in response to environmental changes or pressures. For example, bacteria can evolve quickly due to their short generation times and high mutation rates, leading to antibiotic resistance.