stem cells

• during the development of an embryo most of the cells become specialised. 
• their structure develops to match their function, and they can't later change
• however stem cells are unspecialised and can grow into any type of cell found in the body

there are two types of stem cells:

1. adult stem cells: these can develop into many (but not all) types of cell

2. embryonic stem cells: these can develop into…