Paragraph 1
Researchers from Sweden have found how
got teeth. They say human teeth "first evolved 400
years ago" from an
fish. They studied a
of the fish. It was
to study because the fish is inside
. They used the
X-ray machine in the world to look at the fish. They found that the fish's teeth were very
to human teeth. Humans and 60,000
of vertebrates on Earth
come from this fish.
