model in pieces? what's going on?

hey everyone.
i downloaded a few models but the faces aren’t connected to one another. is there any way to fix this without going through and merging every single vertex? the models are important. i tryed makeing them myself but they failed.

go in edit mode tab, click the vertex icon so your in vertex select mode,
then click A to select all the vertex, hit W key, then from the list select remove doubles. done

thank you :slight_smile: