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🧬 Evidence for Evolution

Follow the clues, fossils, shared bones, matching DNA, and evolution caught in the act, that together make the case for how life changes over time.

3
lessons
~15 min
to learn
🔬 Science
subject
Teens
level
Start the course →

What you’ll learn

  1. Clues Written in RockDefine evolution and explain how fossils, including transitional forms, provide evidence of change over time.Evolution is the change in living things over many generations, so modern species descend from earlier ones. Fossils record this change across rock layers, and transitional fossils like Tiktaalik and the whale series capture the in-between stages that show one group giving rise to another.
  2. Clues Inside Living ThingsExplain how homologous structures, DNA similarity, and vestigial parts reveal common ancestry.Living things carry evidence of evolution in their bodies. Homologous structures share the same bones adapted for different jobs, DNA is more similar in more closely related species, and vestigial parts are leftovers from ancestors, all pointing to descent from common ancestors.
  3. Evolution We Can WatchDescribe directly observed evolution, from antibiotic resistance to Darwin's finches, and explain why the combined evidence is so strong.Evolution can be observed directly: bacteria evolve antibiotic resistance within days, and Galapagos finch beaks shift with droughts. Together with fossils, anatomy, and DNA, these independent lines of evidence all converge on the same conclusion, making the case for evolution overwhelming.

Questions this course answers

What does evolution state about living things?

Evolution is the change in living things over many generations, with today's species descending from earlier ones.

Why is a fossil like Tiktaalik important evidence?

Tiktaalik is a transitional fossil, a fish with wrist-like fin bones, showing how animals moved from water toward land.

What are homologous structures?

Homologous structures share the same underlying build, inherited from a common ancestor, even when used for different jobs.

What does DNA reveal about how species are related?

The more closely two species are related, the more their DNA matches, and all life shares the same basic genetic code.

How do bacteria show evolution happening in real time?

A few bacteria with resistance mutations survive an antibiotic and reproduce, so the whole population becomes resistant, natural selection in fast motion.

Why is the case for evolution considered so strong?

Fossils, anatomy, DNA, and observed change are independent lines of evidence that all converge on evolution.

Grounded in trusted sources

  • Understanding Evolution (UC Berkeley)
  • Smithsonian
  • National Geographic
  • Britannica

Every Wunder lesson is built from real, reputable sources — never invented.

Related Science courses

🧬How Evolution Works🌿On the Origin of Species🦖Famous Dinosaurs♻️Finite Resources and Recycling🕸️Food Chains and Food Webs🕸️Food Webs and Interdependence🗣️Force and Motion Words🪂Forces That Slow Things Down

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