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.