Understanding Evolution: your one-stop source for information on evolution
Resource library Teaching materials Evolution 101
 
EVOLUTION 101

Introduction

Patterns

Mechanisms

Microevolution

Speciation

Macroevolution

The big issues

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The history of life: looking at the patterns

The central ideas of evolution are that life has a history — it has changed over time — and that different species share common ancestors.

Here, you can explore how evolutionary change and evolutionary relationships are represented in "family trees," how these trees are constructed, and how this knowledge affects biological classification. You will also find a timeline of evolutionary history and information on some specific events in the history of life: human evolution and the origin of life.

Cladogram of select 
vertebrates showing where certain characters appear

Download this graphic from the Image library.



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An introduction to evolution

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The family tree


Patterns
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Teach this
Teach your students about evolutionary relationships and phylogenetics:

Find additional lessons, activities, videos, and articles that focus on phylogenetics.