10 points
Fossils in _______ layers of rock are generally estimated to be _______ than fossils found in the upper layers.
older, younger
newer, younger
older, older
newer, older
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The correct set of options will be older, older.
The fossils are formed by the entrapment of the dead remains of the animals in mud or soft rock, which upon being compressed by layers of rocks over the centuries forms and imprint of the animal's body.
The fossils found from deeper layers therefore comprised of fossils which are older
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