That's right! An embryo starts as a single cell and then undergoes a process called cell differentiation where cells become specialized to perform specific functions. This process is guided by genetic instructions and signals from the surrounding environment.

Here's how it works:

* Early development: The embryo's cells are all relatively similar and can potentially become any type of cell in the body.

* Cell fate determination: As the embryo develops, certain cells receive signals that tell them to commit to a particular fate. This can be influenced by their location within the embryo, interactions with other cells, and factors like proteins or hormones.

* Differentiation: Once a cell's fate is determined, it starts to express specific genes that code for proteins needed for its specialized function.

This leads to the formation of all the different cell types in the body, such as:

* Muscle cells: Responsible for movement

* Nerve cells: Responsible for transmitting signals

* Blood cells: Responsible for carrying oxygen and fighting infection

* Skin cells: Responsible for protection

Cell differentiation is a fascinating and complex process that allows an embryo to develop into a complete organism with all its intricate structures and functions.