Gap Fill - Human Teeth - Level 2


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   ancient      because      digitally      fossil      how      million      researchers      similar      species      teeth  

Paragraph 1

Researchers have discovered humans got teeth. The are from Sweden. They say that human "first evolved 400 years ago". They believe our teeth came from an fish. They studied a of the fish. It was difficult to study the fish is inside rock. They had to use the strongest X-ray machine in the world to " dissect" the fish. The researchers found that the fish's teeth were very to human teeth. They also said humans and 60,000 of vertebrates with jaws living on Earth today come from this fish.

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