Acritarchs, conodonts, graptolites and trilobites would all be useful as index fossils, environmental indicators, or relative dating tools for _________.

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Acritarchs, conodonts, graptolites, and trilobites are all organisms that lived during the Paleozoic era and are commonly found in marine shales and carbonates from that time. They are useful for relative dating and as environmental indicators due to their widespread presence and relatively rapid evolutionary changes through the Paleozoic era.

Acritarchs, Conodonts, Graptolites and Trilobites Would All Be Useful as Index