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Have you ever thought how a single cell (the fertilized egg) gives rise to many different cell types

The field of Development Biology is very exciting. It relates almost all biology fields under one frame work.

Traditionally the study of animal development has been called embryology, from the phase where the organism exists between

 fertilization and birth. However development does not stop throughout organism's life. Each day skin cells are replaced, and new blood cells are formed 

Therefore in recent years the name of Development Biology replaced that of embryological studies