<span>Stem cells. There are two types of stem cells: adult stem cells - these are unspecialised cells that can develop into many (but not all) types of cells. Embryonic stem cells - these are unspecialised cells that can develop into any type of cell. And that's all! ;)
Hope this is useful !!!^_~!!!</span>
our water pipes, and the led in some water sources.
The answer is alveoli, there the only structures.
Hope this helps! Have a BLESSED day! :-)
