Explain how animals communicate in such a biologically dense ecosystem

There is no universal auditary language common to the different species of animals. Instead they rely on modes or methods of communication which we can categorize to communication by sound, by visual, by body language and by chemical means. Chemical means through pheromones they secrete in the atmosphere for some species, e.g. bees, wasps ants. etc.

The rearrangement of particles in a physical change. hope this

I'm not sure what your asking buddy.. but i know that you can weld two peices of steel by pure force and pressure.