单选题
发布日期:2022-06-06
There are fossilized nondeciduous trees from Antarctica that bear frost rings.
Deciduous trees are more likely to bear frost rings than are other tree varieties.
The process of fossilization does not completely obscure frost rings in deciduous trees.
Present-day deciduous trees are more sensitive to changes in temperature than were the deciduous trees of ancient Antarctica.
Prolonged and unseasonable frosts that might have occurred in Antarctica when the now-fossilized trees were still living did not always produce frost rings in deciduous trees.
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