At least some of the material must have retained the signal unaffected by subsequent changes in the environment.
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Related: subsequent
Prev: The first level with the meat locker classroom was the operating wing that would explain the red linoleum versus23 the equally aged20 brown stuff on the subsequent floors; for all the blood spillage during surgeries.
Next: In 1995 and 1996, researchers trapped and removed certain waterfowl-nest predators, primary raccoons and striped skunks, then observed subsequent survival rates for songbird nests.
