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Pronunciation Guide
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They use fossils of species that were only alive during a specific time period to infer the age of the rocks they’re found in.
Like, trilobites were on Earth for a limited time— and different types of these creepy crawlies had brief moments to shine.
So when the same type of trilobites are found in rock layers in two different places, we can assume they’re around the same age.
Listen to native speakers pronounce “crawlies” in real conversational contexts with synchronized timestamps and subtitles.