Why is cell specialisation important for the growth and development of a healthy baby from a fertilised egg
AQA GCSE

Cellular specialisation is the process by which an initial undifferentiated cell, gets specialized (attains a structure and function characteristic of a given cell type). In this case, the embryonic stem cells, undergo specialisation to give the many different cells and tissues of the body. Without cellular specialisation during embryo development, we wouldnt have all these varying tissue types fine-tuned to their functions.

[content deleted] - user123802726recklesschicken

what's the rest of the question