Nothing is entirely passive or stable; everything is in process, constantly undergoing transformation, constantly undergoing modification. All matter is alive and in process: a complex, interwoven web of materials, all affecting each other, competing, forming alliances, initiating new processes and dissipating others. Humans are inextricably enmeshed in these webs, these assemblages.
Assemblage is a concept that goes back to Deleuze and Guattari. Foreshadowed in Anti-Oedipus, it was refined in A Thousand Plateaus. Deleuze defines an assemblage as follows:

‘It is a multiplicity which is made up of many heterogeneous terms and which establishes liaisons, relations between them across ages, sexes and reigns – different natures. Thus, the assemblage’s only unity is that of co-functioning: it is a symbiosis, a ‘sympathy’. It is never filiations which are important but alliances, alloys; these are not successions, lines of descent, but contagions, epidemics, the wind.’
Deleuze and Parnet, Dialogues: 69
‘The concept of assemblage is helpful. Ecologists turned to assemblages to get around the sometimes fixed and bounded connotations of ecological “community.” The question of how the varied species in a species assemblage influence each other—if at all—is never settled: some thwart (or eat) each other; others work together to make life possible: still others just happen to find themselves in the same place. Assemblages are open-ended gatherings. They allow us to ask about communal effects without assuming them. They show us potential histories in the making. For my purposes, however, I need something other than organisms as the elements that gather. I need to see lifeways—and non-living ways of being as well—coming together. Nonhuman ways of being, like human ones, shift historically.’
Anna Tsing, Mushroom at the End of the World: 23

‘All earthlings are kin in the deepest sense, and it is past time to practice better care of kinds-as-assemblages (not species one at a time). Kin is an assembling sort of word. All critters share a common “flesh,” laterally, semiotically, and genealogically. Ancestors turn out to be very interesting strangers; kin are unfamiliar (outside what we thought was family or gens), uncanny, haunting, active.’
Donna Haraway, Staying with the Trouble: 103