An Increase About 1,000 Years Ago in ¹³C Content of Human

question 13

Multiple Choice

An increase about 1,000 years ago in ¹³C content of human collagen from archeological sites in eastern North America probably records

• A) replacement of vegetables and grains in the diet by meat.
• B) replacement of corn by beans and squash in the diet.
• C) increasing consumption of corn.
• D) increasing levels of ¹³C in soils.
• E) increasing levels of ¹³C in the atmosphere.

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