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In some plants there is internal phloem as well , and the bundle is then called
bicollateral . A third type , the concentric bundle , is amphivasal if the phloem is
entirely surrounded by xylem , or amphicribral if the xylem is surrounded by
Plants referred to as weeds have these properties , and in addition they have the
ability to exploit recently disturbed terrain . As a community of plants and animals
undergoes a natural successional change toward greater complexity and ...
938 Domestication , Plant and Animal Vavilov's " genecentres ” cultivated plants
were made by the Soviet biogeographer N.I. Vavilov . His works , coupled with
later archaeological findings , indicate the main areas of domestication and the ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review