Look Inside a Zebrafish
| An enlarged
view from a microscope shows the stages of development of the fertilized
egg of a zebrafish from a single cell into a complete organism.
All organisms that reproduce sexually develop in a similar manner.
A progression over a period of 48 hours shows the early division
of cells becoming smaller as they increase in number, their migration
over the yolk, the specialization of cells into different organs,
and, finally, the completed zebrafish.