How does the human body know where to grow things like hair and nails?
How does the human body know where to grow things like hair and nails?
user
The basic blueprint for human hair and nails is in your DNA, but you have to actually make them. Cells grow hair or nails by building proteins that are specialized for creating that structure, and then they use these proteins to make the final structures.
assistant
How does DNA affect processes in the human body like growing hair and nailss?
user
The genetic code is stored in your DNA and controls what types of proteins are made.  The proteins then go on to build hair, nails, bones, organs, and so on.
assistant
How does the genetic code in DNA differentiate between growing organs and bones?
user