If you have ever come across a grove of Aspen trees you may be thinking that they are all separate trees living near one another. However, if you looked below the surface you would see that they all are one living organism.
Watch as Dr Tracy uses this as an example of how we too are individuals on the surface, yet we are all part of the one living body.
Watch the full talk here: https://youtu.be/lBJaTevdsCo