OD A lizard is an ancestor of a frog. 3. Trilobite fossils have been found in rock that is 521 million years old. They have also been
found in rocks that are more than 252 million years old. Trilobite fossils have not been found in
younger or older rocks. What does this tell you!
(Mark the one best answer.)
А
Trilobites became extinct 252 million years ago.
B
Trilobites became extinct 521 million years ago.
C Trilobites lived on Earth for 252 million years.
O D Trilobites lived on Earth more than 521 million years ago