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Department of Biology
King’. College

" The fact that C4 plants are richer in 13C than C3 plants can be used to study pest diets of animals by analyzing their bones or shells. Fossil snails, dating from about 3,000 to 4,000 years ago in the northern Negev Israel, provide evidence for a more southerly distribution of C3 plants at that time, implying moister conditions.

G.A. Goodfriend,...

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