trilobites were animals that lived in the ocean between 520 million and 540 million years ago. a trilobite…

trilobites were animals that lived in the ocean between 520 million and 540 million years ago. a trilobite fossil can be used as an index fossil.\nwhat can a scientist learn from a trilobite fossil found in a layer of rock?\na. that the area near the fossil was always dry land\nb. the temperature of the trilobite when it became a fossil\nc. that no other types of fossils will be found in the area\nd. the age of the layer of rock the trilobite fossil was found in

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