- A new study looks at tuna evolution today.
- Scientists studied how tunas changed over time slowly.
- The asteroid hit 66 million years ago worldwide.
- Tuna size grew slowly in many groups over time.
- Warm blood in tuna evolved later in groups.
- These changes happened in different tuna families.
- Evolution did not happen immediately after the asteroid.
- The study used fossils and samples.
- Findings can help people protect tuna species today.
- Scientists said tuna evolution took many millions of years.
Difficult words
- evolution — Slow change of animals or plants over time
- asteroid — A rock from space that can hit Earth
- fossil — A preserved bone or mark from long agofossils
- species — A group of similar living animals or plants
- warm blood — A way animals keep a steady body temperature
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Discussion questions
- Do you eat tuna?
- Should people protect tuna species?
- Have you ever seen a fossil?
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