Vertices aren't connected?

Support Modeling
1

Hey guys, I’m quite new to Blender and I’ve been doing my first ever model of what’s supposed to be a biped pig and attempting to rig it. I have noticed however that my vertices have “disconnected”. Here’s what I mean:

Untouched:

Moving that vertex:

Here’s the .blend:
https://ufile.io/8e4fe

Thank you very much!

2

select the vertices that you want to be connected, then press Alt+M. you then get the option to merge the verts in 3 different ways:

Merge at the first selected vert, the last selected vert or the centre of the verts.