Read the passage: 'Dendrochronology—the study of annual tree growth rings—provides an exceptionally precise paleoclimatic record. Wide rings typically correlate with warm, moist seasons, whereas narrow rings record periods of severe drought or prolonged cold.' According to the passage, what environmental condition is indicated by narrow tree rings?

Answer and explanation

Correct answer: D. Drought or prolonged cold temperatures

  1. Step 1: Locate the sentence discussing narrow rings: 'whereas narrow rings record periods of severe drought or prolonged cold'. Step 2. Match directly: drought or prolonged cold. Answer: Drought or prolonged cold temperatures. Why not the others: Excessive rainfall and warm conditions produce wide rings; carbon dioxide is not mentioned in the excerpt.

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