What is the process in a cell that leads to the development of specialized cells tissues organs and systems?

The process leading to the development of specialized cells, tissues, organs, and systems is called differentiation. It begins with stem cells, which have the potential to develop into various cell types. Through a series of regulated gene expression changes and signaling pathways, these stem cells become specialized for specific functions, forming tissues. As cells group together, they organize into organs, which then work collaboratively within systems to perform complex biological functions.