In rock layers, jellyfish fossils are found lower than trilobite fossils, and trilobite fossils are found lower than ammonite fossils. What can be determined from this information?
Answer
A
Trilobites existed before jellyfish and ammonites.
B
Jellyfish existed before trilobites and ammonites.
C
Ammonites existed before trilobites and jellyfish.
D
Jellyfish, trilobites, and ammonites lived together.