In exploring for coal deposits, geologists sometimes look for fossil indicators: fossilized remains of Carboniferous plants. Which of the following combinations in a sample would suggest the presence of rocks that might bear coal beds?
1. mosses and liverworts, but no vascular plants
2. angiosperms and mosses
3. lycophytes and gymnosperms
4. lycophytes and tree ferns
Answers: 3
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In exploring for coal deposits, geologists sometimes look for fossil indicators: fossilized remains...
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