6. Fossils are remains of organisms found in sedimentary rock. These remains are found in thousands of rock layers around the world and provide evidence for Earth's long history of changing lifeforms.

Rock layers that formed more recently
contain fossils of animals only.

contain fossils of plants only.

contain fossils that resemble existing species less closely than do fossils found in older rock layers.

contain fossils that resemble existing species more closely than do fossils found in older rock layers.

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I believe the answer is contain fossils that resemble existing species more closely than do fossils found in older rock layers

The rock layers that formed more recently contain fossils that resemble existing species more closely than do fossils found in older rock layers.

Fossils refers to the remains of plants and animals which can be found in several rock formations around the world. The fossils in rocks serve as a record of the earth's long history as well as an evidence for evolution.

More recent rocks will contain fossils that resemble existing species more closely than do fossils found in older rock layers. Since fossils of recent species will be fossilized in more recent rock formations.

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