Because those are two prime locations for viewing it! The blastula regularly "cleaves", or splits its cells as the embryo forms. This is a natural part of development, and it is one of the most blatant and predictable places in the body to view pure cell division.
Amoebae as Exemplary Cells: The Protean Nature of an Elementary ::
single-cell organism, and the differentiated tissue cells of higher plants. and animals were not without their critics, however, most notably the
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In the root tip, is where all of a plant's cell divisions occur. In the root tip are the only"immature" cells of the plant that can undergo division. As the cells divide, the root grows and matures. Once again it is a very predictable place to view cell division.
These cells divide faster and the stages , phases of division are more clear, observable in the tip region
Apologetics Press - Human Cloning and Stem-Cell Research—Science's ::
Cell division began on this side too, and the hair knot was tightened to prevent any . Also in 1997, the first human embryonic stem cells were isolated
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The cells divide, increases the number of cells as a result plant grows either at root tip or at the shoot tip(the upper part)
save electricity, save water,plant as many trees, avoid plastic baggies. A little effort and awareness can save us
 Red Hat's Rough Recovery From CFO Exit
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