按时间顺序
发表于 2025-3-23 13:08:43
,Angiosperms — the Culmination of Plant Evolution,so were not preserved as fossils. But unless someone makes the fortunate discovery of an unequivocal pre-Cretaceous angiosperm we must use the available evidence to learn what we can of the first angiosperms and their subsequent evolution.
mitten
发表于 2025-3-23 15:37:19
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Ceremony
发表于 2025-3-23 22:00:10
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FORGO
发表于 2025-3-24 02:02:21
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insolence
发表于 2025-3-24 02:53:21
Plants, Their Fossilization, and Techniques of Fossil Study,atched what may be a preliminary stage in the formation of fossils. When the stream slows down as it meets a body of standing water, such as a pond, lake, or sea, its load begins to be dropped or to sediment out. The heavier particles are dropped first, closer to shore, and the lighter particles are
大气层
发表于 2025-3-24 07:36:30
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愚蠢人
发表于 2025-3-24 13:49:13
,Early Plant Life — the Thallophytes,k into the more direct evidence that can be provided only by fossils of the plants themselves. This evidence, if forthcoming, would substantiate the biogeochemical data presented earlier. Until recent years it has been generally accepted that many Precambrian rocks were highly metamorphosed and devo
fleeting
发表于 2025-3-24 16:57:45
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Asparagus
发表于 2025-3-24 21:12:27
Some Consequences,terval from 370 (start of the Middle Devonian) to 345 (start of the Mississippian) million years ago (Table 4-1). This is the second 25-million-year episode in the evolution of land plants. We begin with a brief resume of the fate of the ten groups that were present in Emsian strata, shown graphical
inchoate
发表于 2025-3-25 02:18:16
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