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A molecule of nitrogen which you have just breathed in may have been part of a plant that lived thousands of years ago, or part of a dinosaur that lived millions of years ago. This illustrates the principle that
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- Dead organisms may be fossilized
- Molecules of cytoplasm may be replaced by inorganic salts.
- Nitrogen does not combine readily with other elements.
- Decay bacteria cycle elements.
Correct Option: D
NA
