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

Dead organisms may be fossilized

Molecules of cytoplasm may be replaced by inorganic salts.

Nitrogen does not combine readily with other elements.

A molecule of nitrogen which you have just breathed in may have been p

1.	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
A.	Dead organisms may be fossilized
B.	Molecules of cytoplasm may be replaced by inorganic salts.
C.	Nitrogen does not combine readily with other elements.
D.	Decay bacteria cycle elements.
Answer» E.

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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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