why do seeds need oxygen to germinate
Seeds don't breathe in the same way mammals do. Instead, they breathe at a cellular level. In cellular respiration, the seed uses stored sugars, water and oxygen to burn energy at a cellular level and germinate, or sprout. Respiration increases dramatically as the seed sprouts. The seed continues to breathe until the plant can make its own food via the process of photosynthesis.
The oxygen comes from tiny pockets of air in the soil. Most loose soil has plenty of air for seeds, but if the seed is surrounded by water, it will not be able to obtain enough oxygen to germinate.
The "moving wall" represents the time period between the last issue available in JSTOR and the most recently published issue of a journal.
Moving walls are generally represented in years. In rare instances, a publisher has elected to have a "zero" moving wall, so their current issues are available in JSTOR shortly after publication. Note: In calculating the moving wall, the current year is not counted. For example, if the current year is 2008 and a journal has a 5 year moving wall, articles from the year 2002 are available.
Terms Related to the Moving Wall Fixed walls: Journals with no new volumes being added to the archive. Absorbed: Journals that are combined with another title. Complete: Journals that are no longer published or that have been combined with another title.
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