Maybe I’ll try to answer that question. Let’s go step by step, starting with the body complex. The body is a second-density physical structure that contains the basic instincts needed for survival, so second-density beings (we call them animals) definitely possess body complexes. Next we have the mind complex, which in Confederation terminology is our thoughts and emotions, something that exists between our body and spirit and shapes our personality.
A dog or a cat looks like it feels emotions and certainly thinks in its own way; dogs and cats have personalities. But does a snake or a crocodile have a personality? This is a difficult question, but they think in their own way and figure out how to hunt and eat. One could therefore to ponder if some creatures are only body complexes or mind and body complexes. While others are body and mind complexes, like household pets, that’s for sure. Ultimately, I think that all animals have body and mind complexes, even snakes, but they are very fragile personalities.
Now let’s move upward to the spirit. Are animals able to recognize their immortal consciousness, their individuality, or participate in something that might be called spiritual development? It appears they are not, because they do not have a spirit complex. Yet sometimes, for example, dogs display very human behaviors because they have been given so much love, and they seem to engage in family life a bit differently; perhaps their spirit complex is forming and is still in an early stage. And what about dolphins? According to the Confederation, dolphins are third-density beings with the ability to open to the Creator’s love and light; they dream and meditate and certainly connect with the Creator, perhaps in their own, more intuitive way than we do. They clearly are not the kind of second-density beings you are asking about, yet we see them as animals, so they belong in this comparison. Thus, dolphins must possess a spirit complex.
I would sum it up like this. Generally the second-density beings are body and mind complexes (not spirit). They lack a spirit complex because they cannot focus their will on magical or spiritual practice. The first-density “beings,” I assume, are solid body complexes (with the mind complexes as a seed that has the potential to develop). All third-density beings, in turn, are body, mind, and spirit complexes.
There is also another, broader way to look at it. Confederation material sometimes states that everything is consciousness, or that everything is spirit, or that everything is love, or that only intelligent infinity exists, or that all that is is one infinite Creator. All these ideas point to a fundamental substance that underlies reality, and everything else arises from it. You can call this substance spirit. From that perspective, reality contains nothing that is not spirit which emerges as an active force from infinity.
Therefore, with this approach, even the second density possesses something in the shape of a spirit complex; everything possesses spirit, even if it is not obvious. And everything else is what comes from spirit, only subject to distortion. You could think of it that way, but I think it somewhat changes the original meaning of the three complexes Ra speaks of. It’s simply a way of equating the One Infinite Creator with the One Infinite Spirit Complex. However, it’s important to remember that the Confederation doesn’t use such terminology. Even if it makes sense, the technical meaning of “spirit complex” appears when talking about mind/body/spirit complex.
I’ve focused on animals, omitting plants, but I think these considerations can be adapted to plants as well. For example, trees, or most trees as I guess, are mind-body complexes (not just body complexes, but lacking a spirit complex).