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Essay / Research Paper Abstract
A 3 page paper which examines the evolution of seeds. Bibliography lists 3 sources.
Page Count:
3 pages (~225 words per page)
File: JA7_RAseed1.rtf
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Unformatted sample text from the term paper:
ground, find their way through the intestinal track of an animal and be deposited elsewhere, or blow away in the wind. In these processes new plants are formed. The following
paper examines the evolution of seeds and also discusses the difference between angiosperms and gymnosperms. The Evolution of Seeds In relationship to
the fossil evidence of seeds it is noted that "Fossils of angiosperms in the Cretaceous are still rather rare" (Steur, 2010). The reason for this appears to be due to
location. In dry and arid regions the seeds were not preserved as they were in moister regions of the world. As such a great deal of fossil records are not
present for particular locations and plants. "Most discovered plant fossils appear to have been associated with wet lowland areas where organic decomposition could be inhibited by silt and mud, and
fossils left due to pressures borne by sedimentation" (Faculty.unlv.edu, 2010). The earliest seeds, or seed plants, are known as progymnosperms. The fossil
records indicate "vegetative morphologies to seed plants, but not all progymnosperms had seeds or seed-like structures" (Leubner, 2000). Plants reproduced in many different ways such as spore production which is
believed to be connected, evolutionarily speaking, to seed creation. There are fossils of fern plants that produced seeds, or seed like structures, and it is believed that seeds themselves evolved
in many different ways as they moved or transitioned from one form of reproduction to another. "Today there are four major lineages of extant gymnosperm seed plants: Cycadopsida (cycads, Palmfarne),
Ginkgopsida (ginkgos), Pinopsida/Coniferopsida (conifers, Nadelb?ume), and Gnetopsida (gnetophytes)" (Leubner, 2000). The gymnosperm seed plants are rather different from the angiosperms. The gymnosperms
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