gnostic
The Lost One
Yet science has no definition for consciousness
You keep saying that, except that’s not true.
The problem isn’t that there is one definition, there are many definitions, some in sciences, some in num of different philosophies, and still more in different religions.
Science do have not just a definition, but there are some explanations, but they are dependent on which sciences (Natural Sciences, Applied Sciences or Social Science) or their respective fields.
As I have never studied psychology (a branch in Social Science), so I prefer the explanation offered in biology (hence that falls into Natural Sciences category) that not only focused on human consciousness, but also of other animals that have nervous systems (eg nerves, brains, spinal cords, sensory organs (eg eyes, ears, noses) and nerves in tissues that give sense of touch (somatosensory system) & taste (gustatory system)) in their biology, so human and non-human animals.
For Applied Science category, that mainly revolved around medical science, that are mainly focused on humans, not only about human biology, but also to diagnose ailments or diseases, and treating them through medicine or through surgery. The main science in medicine would be neuroscience, like neurology.
The most simplest explanation to consciousness is that animals with some sensory perceptions (via sight, sound, touch, smell) are made aware of their surroundings or environment, and all of that are processed & controlled by their brains. Some animals do not even have central nervous system (brain & spinal cord), but still have nervous systems that be complex or primitive, and those few that don’t have brains (sponges, corals, jellyfish, starfishes, etc), are all invertebrate animals.
Then there are non-animal organisms, like plants, fungi, archaea & bacteria, all of them without any nerves…none of them are “conscious“.
You leave out a lot of organisms, if you only focus on consciousness. Consciousness are not relevant to these other living organisms…consciousness plays no part for plants.