Concept
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The Role of the Cell Cycle
Cell Division and Growth
A sea urchin begins life as a single cell that (a) divides to form two cells, visible by scanning electron microscopy. After four rounds of cell division, (b) there are 16 cells, as seen in this SEM image. After many rounds of cell division, the individual develops into a complex, multicellular organism, as seen in this (c) mature sea urchin.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Introduction. October 16, 2013."
http://cnx.org/content/m44457/latest/Figure_10_00_02abc.jpg
OpenStax CNX
CC BY 3.0.