Context: Heartwood (or duramen) is wood that as a result of a naturally occurring chemical transformation has become more resistant to decay. Heartwood formation occurs spontaneously (it is a genetically programmed process). Once heartwood formation is complete, the heartwood is dead. Some uncertainty still exists as to whether heartwood is truly dead, as it can still chemically react to decay organisms, but only once.

Question: What's another word for "duramen"?
Answer: Heartwood

Question: What is heartwood naturally resistant to?
Answer: decay

Question: How does heartwood formation occur due to its being genetically programmed?
Answer: spontaneously

Question: What adjective describes fully formed heartwood?
Answer: dead

Question: Despite being considered dead, what can heartwood have one chemical reaction to?
Answer: decay organisms