Why should we have to start with "consciousness"?
It sounds so abstract....
IMO, consciousness is the ultimate result of reaction to stimulus and/or sensory motor responses.
At the fundamental level, all things behave in a brute force reactive manner from nano scales to making selective choices, such as the "fight or flight" response, and subsequent "survival strategies".
IMO, all of this is a result of evolution of learning and evolving inter-relationships. A brainless slime mold which contains no brain, is still able to
memorize time intervals. Without being consciousness (as we define it) how could it possibly learn to keep track of time? The entire organism,
a single celled polyp, responded to, and memorized the interval to maintain in it's most parsimonious state of existence.
Does it not show that consciousness via thought is not a prerequisite for learning, but already inherent at least in bio-organisms even as they do not posses a single "processor" of information, but rather a network of sensory receptors, a form of hive mind, which seems to work extremely well in the insect world.
For every action of one object on another object, there is a natural mathematical reaction. This already happens at quantum level. Thus the reaction to brute force may start as a brute response, but as molecules/organisms become more complex in structure and form a physical hive mind, brute force becomes distributed over the entire organism and several brute force reactions make the response more complicated as different components of the organism attempt to execute their own reactions to the stimulus, i.e. the hive mind (the entire organism), having different sets of experiences of interaction with forces of different values and functions, begins to compute (not of its own free will) the most suitable response to the stimulus.
Darwinian Evolution.
Once an organism has reached a fundamental state of awareness or cognition of numbers (values and functions) which are not parsimonious to its life, natural selection will eventually yield advantage to the best adapted. This does not exclude the brain and the marvelous things it can do.
IMO, "awareness" (in the abstract) is the "experiencing" of your environment by a collective of responses. But need we compare this to consciousness? Can this not be called a pseudo-intelligence? A hierarchy of pseudo-intelligent orders, from the most subtle potential Implicates, to Physical expressions in the observable form of reality at the human level and all other stages of evolution.
Even Lemurs (a precursor to humans) can "count", i.e. recognizing the difference between
more of this, and
less of that.
They don't count 1,2,3,4,,,,,,but they do count, because it brings a reward if they recognize the answer, and they are as good in that humans !!!! Riddle me that.....

IMO, that's pretty conscious albeit simplistic.