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Trilobites are thought to have been a marine organism because the fossils are found in rocks that contain other salt-water animals. Trilobites are thought to be one of the earliest groups of arthropods.
Wiki User
∙ 10y ago
Wiki User
∙ 11y agoIt may be that the horseshoe crab is related to the trilobite, although it is difficult to be certain.
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How do you find if its a fossil?
If the rock is sedimentary in origin and if it has a repeating organized pattern or resembles a shell or other organism that is alive today it may be a fossil. There are numerous books in stores or libraries with pictures of fossil organisms that you can compare with your finds.
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