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It wasn't out of the realm of possibility.
Previously, Ian had learned from the murals that the ancestors of the Redwood Natives used many methods to ensure their descendants remembered the knowledge they needed.
The most stable and effective learning machines were abandoned due to difficult maintenance and excessive energy consumption. Ultimately, this laboratory with an extraterrestrial heterogeneous ecosystem chose to use a biological plugin to carry those essential memories, while also modifying themselves, imprinting part of the most critical knowledge and thought patterns into their offspring's DNA.
Ian knew that the Terra People were a stable species with extremely stable DNA that seldom experienced abnormal mutations due to reproduction. The advantage was that even in various extreme conditions, they could remain stable without mutations; the downside… paired with the Terra People's bio-alchemy, there were no downsides.