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Verbal·Expression of Ideas·Rhetorical Synthesis

hard

While researching a topic, a student has taken the following notes:

• Dendrochronology uses the annual growth rings of long-lived trees to construct multi-millennial climate chronologies.
• Bristlecone pines (Pinus longaeva) in California’s White Mountains can live for over 4,800 years.
• Sub-fossilized bog oaks in Ireland and Germany provide overlapping tree-ring sequences spanning over 10,000 years.
• Dendrochronological calibration revealed that raw radiocarbon dating systematically underestimated archaeological ages due to past fluctuations in atmospheric carbon-14 concentrations.
• Tree-ring calibration curves (such as IntCal20) are now indispensable for establishing accurate absolute dates in archaeology.

The student wants to explain how dendrochronology improved the precision of radiocarbon dating. Which choice most effectively uses relevant information from the notes to accomplish this goal?

A

Because tree-ring sequences from long-lived bristlecone pines and overlapping bog oaks extend back more than 10,000 years, dendrochronologists compared radiocarbon ages of known-age wood against true calendar dates, exposing systematic underestimates caused by fluctuations in atmospheric carbon-14 and producing calibration curves such as IntCal20 that archaeologists now rely on for accurate absolute dating.

B

Dendrochronology uses the annual growth rings of long-lived trees, such as bristlecone pines in California’s White Mountains, to construct multi-millennial climate chronologies.

C

Sub-fossilized bog oaks in Ireland and Germany provide overlapping tree-ring sequences spanning over 10,000 years, making them among the most valuable records in dendrochronology.

D

Because raw radiocarbon dating systematically underestimated archaeological ages, dendrochronological calibration curves such as IntCal20 are now indispensable for establishing accurate absolute dates in archaeology.