This type of trilobite is an index fossil that lived about 440 million years ago. Fossils of the trilobite and the brittle star were found in the same rock layer. What can you infer about these two organisms?
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Trilobites were arthropods (they belonged to the phylum Arthropoda) — like many invertebrate animals living today, including crustaceans, spiders and insects. Geologists know that they were marine animals because of the rocks in which they are found and the other types of fossils associated with them.
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