Question: why do you want to know how the earliest skeletons grew?

Duncan Murdock answered on 17 Mar 2010:

Before the Cambrian explosion, the time period I am looking at, no animals had shells, teeth or bones. The suddenly loads of different kinds of skeletons appeared in the fossil record and we don’t know what caused this sudden change. By working out how they grew I’m hoping to see if I can work out what they were used for, and if one animal figures out one way of growing them then evolved into all the different kinds, or if lots of different animals did is separately.