Fossils found in lower strata of undisturbed sedimentary rocks are _______ and _______ similar to modern-day organisms than those found in higher strata.

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Fossils in lower strata are older due to the way sedimentary rocks form over time, with newer layers accumulating on top of older ones. These older fossils are generally less similar to modern-day organisms, reflecting the evolutionary changes that have occurred over time.

Fossils Found in Lower Strata of Undisturbed Sedimentary Rocks Are