In our ever expanding, personal universes it becomes easy to overlook the small galaxies that are all around us. Take, for example, the ground we stand, and walk about on. Put a shovel into it. Remove a perfect clod. (Not to be confused with the clod racing his super loud, super Hemi up the street, spewing foul crap in the atmosphere to rendezvous with other clods in his very small, hopefully shrinking galaxy.)...
I digress. Anywho, Sit your bad ass down on the ground and check out this small galaxy, mostly unaware that it is split from its larger part.
The organisms you're likely to see are classified as macro fauna: Earthworms, slugs, Snails, ants, beetles to name the most obvious. The ones your unlikely to see are meso fauna: Mites, springtails to name a couple. Then we have the micro fauna and micro flora. These include bacteria, fungi, protozoa, roundworms, mycorhiza and more.
All these alien life forms rendezvous in a healthy soil to break down organic matter and create soil structure and maintain their small galaxy.
We humans can disrupt this process by adding too much fertilizer, pesticides and other detritus effectively killing these organisms, essentially killing our soil.
Each of these clods is interconnected with everything else. Each dependent on the other, more or less. Even if we don't quite understand how. Creating an ever-expanding universe reaching infinitely beyond our earth.