Evolution is one of the most fascinating topics in biology. It’s the process by which species change over time through genetic variation and natural selection.

The theory of evolution has been supported by numerous examples from different fields of study. Here are two examples that provide evidence to support the theory of evolution.

The Peppered Moth

The peppered moth (Biston betularia) is a classic example of natural selection in action. This species has two color morphs – light-colored and dark-colored. In the early 19th century, the light-colored morph was more common than the dark-colored morph because it was better camouflaged against the lichens that covered trees in industrial cities.

However, during the Industrial Revolution, pollution from factories killed off lichens, causing trees to turn black. As a result, the dark-colored moths became better camouflaged than their light-colored counterparts. Over time, natural selection favored the dark morph, and their population increased while that of light morphs decreased.

This example illustrates how environmental changes can lead to changes in gene frequencies over time. It also demonstrates how natural selection can drive populations towards certain traits that increase their chances of survival.

The Fossil Record

The fossil record provides strong evidence for evolution through the observation of transitional forms between species. Transitional forms are organisms that show characteristics intermediate between those of ancestral and descendant groups. They provide a snapshot into how species have changed over time.

One classic example is Archaeopteryx lithographica – a bird-like dinosaur from the Late Jurassic period around 150 million years ago. Archaeopteryx had feathers like modern birds but also had teeth and a long tail like other dinosaurs.

This discovery supports the idea that birds evolved from small theropod dinosaurs as they acquired traits such as feathers for insulation or display purposes and eventually developed flight capabilities over millions of years.

Another example is the evolution of whales from land-dwelling ancestors. The fossil record shows a series of transitional forms that have gradually evolved from four-legged terrestrial animals to fully aquatic whales.


These two examples, among many others, provide compelling evidence to support the theory of evolution. The peppered moth illustrates how natural selection can drive populations towards certain traits in response to changing environments, while the fossil record shows how transitional forms provide snapshots into how species have changed over time.

By understanding the evidence for evolution, we gain insight into how life on Earth has diversified and adapted over millions of years.