Biology, 20.09.2019 02:30 minnahelhoor

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?
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.

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In rock layers, jellyfish fossils are found lower than trilobite fossils, and trilobite fossils are...