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Identify the correct sentence:
Answer variants:
The time passed since death of a plant or animal can be calculated by measuring the amount of nitrogen present in their body.
In compressions the precipitation of minerals leads to the infiltration of the cell wall.
Casts are generally unfilled or may be partially filled with sediment.
Tree trunks buried along the river 2 million years ago were fossilised when the organic substance was replaced by silica over time.
Answer:
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