Evidence for Evolution
Fossils, anatomy, DNA and embryos support common ancestry.
About this topic
Evidence for common ancestry comes from many sources. Fossils show transitional forms and a record of change over time; comparative anatomy reveals homologous structures such as the pentadactyl limb; embryos of vertebrates look similar early on; DNA and protein sequences are more similar between closely related species; and biogeography shows related species in nearby regions.
Observed evolution, like antibiotic resistance, adds direct evidence. Vestigial structures, such as the human appendix, are traces of ancestors.
The whale flipper, bat wing and human arm have the same bones arranged differently, evidence for descent from a common ancestor adapted to different uses. Vestigial structures, such as the human tailbone and the tiny hind leg bones in whales, are leftovers from ancestors. Fossils like Tiktaalik link fish to land animals, and DNA comparisons show humans and chimps are closer relatives than humans and gorillas.
Biogeography adds evidence, such as marsupials mainly living in Australia. Evolution is also seen directly, in bacteria becoming resistant to drugs and in insects becoming pesticide resistant. Students sometimes say evolution is just a theory; in science a theory is a well-tested explanation supported by huge evidence, not a guess. Another is that there are missing links; many transitional fossils have been found.
Key ideas
- Homologous structures
- Fossil record
- Molecular similarities
Quick check
Use cases: where Evidence for Evolution helps
- Homework: review the key idea behind Evidence for Evolution before you start a problem set.
- Exam revision: use the quick check to test whether you can recall Evidence for Evolution without notes.
- Visual learning: play with the interactive lab to see how Evidence for Evolution changes when you adjust its inputs.
- Teaching a friend: explain Evidence for Evolution in your own words, then compare your version with the key ideas.
Biology underpins medicine, farming, conservation and biotechnology.
Frequently asked questions
What is Evidence for Evolution?
Fossils, anatomy, DNA and embryos support common ancestry.
What will I learn in Evidence for Evolution?
Homologous structures. Fossil record. Molecular similarities.
Is Evidence for Evolution part of Biology?
Yes. It is one of 150 Biology topics on LearnViz HighSchoolEdu, with 3 key ideas, a live animation and a quick check.
Does the Evidence for Evolution lab work on a phone or tablet?
Yes. The animation resizes to fit your screen and supports touch, so you can drag, tap and slide with your finger.
How should I study Evidence for Evolution?
Read the summary and key ideas first, play with the interactive lab to see the idea in motion, then answer the quick check. If you get a question wrong, go back to the key idea it tests.
Do I need an account, and is my progress saved?
No account is needed. Marking a topic as learned is saved in your own browser, so it stays on that device and is not sent to a server.