Before the Great Abandonment, it is known that there were settlements around the planet where mainly an unknown list of scientists, maintenance personnel and the top chief stayed after the planet was condemned to be fit for settlement after the terraforming process. It is not known how long the process itself lasted, which is known for the planet Mars is known to have taken at least 300 years before they could bring life. But the ambition of the planet for the sake of the project required slightly different processes than planned. There is no evidence of what the surface would have looked like before or even if there was a sufficient presence of water and solutes suitable for life and it seems that documents were lost together with the abandonment, but in theory: the most effective process for the terraforming processes after the establishment of a stable atmosphere and a strong magnetic field is oxygen enrichment.
Recently, technologies have been developed that are 50,000 times more efficient at converting oxygen than genetically engineered chloroplasts, and it is speculated that they did use this technology. It seems that the people who worked on this project tried as much as possible to keep the planet sterile from unlicensed life.
But one thing is clear from every experience:
No matter how hard we try, humans are dirty. Mechanical work outside is required in this atmosphere since at that time humans could not survive it, but biological human contact is required when it comes to working with accurate biological knowledge.
And also when it comes to business.
There are certain biological people and children for whom the work of eliminating 'contaminants' was not exactly successful. The 99.99999% had a chance of success, but the few managed against all odds to escape from there. Especially in the areas defined as "vegetation areas", where chimera plants were bred, tested and created.
It is not known how they managed to escape and how many, but those who did manage to escape, they arrived in a foreign environment, but without competition and rich in resources.
The perfect substrate for the growth of the microscopic creatures.
They are called "the refugees", the only non-chimer creatures living on the planet. What they all have in common is that they are microscopic creatures, so the human eye is unable to see them and mechanical eyes are imperfect. There is always a chance for an earthly refugee to reach the planet and if the conditions are perfect, they can be called the "hidden pioneers" of the planet, and those who are always ignored, until it is too late.
According to a number of quantum computer simulation hypotheses, the "refugee" creatures that managed to set foot, even the smallest, are shown according to the following list:
Cylindrospermum
Chroococcidiopsis thermalis
Merismopediaceae
Aenigmarchaeota
Heimdallarchaeota
Nitrosococcus
Deinococcus radiodurans
Myxococcus xanthus
Chlorobiota
Candidatus Brocadia anammoxidans
Ammonia tepida
Dinoflagellates
Acantharea
Dileptus
Paramecium
Amoeba proteus
Cochliopodium
Apart from these, it is known that a very large number of the chimeras use symbiotic macroscopic organisms such as intestinal bacteria (such as E. coli) and nitrogen-fixing bacteria at the bottom of symbiotic plants, for which they do not have clear and complete information about what the exact types are.
It is also known that all known ecosystems contain a complete quota of viromes for all known systems.
Although a virus capable of infecting chimeras will not yet be developed and it is known that they were isolated, it is premature to say that in the near future, a virus capable of infecting a chimera will emerge, but how, how much and which one is a mystery, but when they emerge, they will change entire ecologies.
A possible candidate for viruses that will succeed in infecting chimeras are influenza viruses of the 'corona' type which, even under the most sane conditions, are viruses that change quickly.