I am currently trying to figure out how one would begin to introduce life to a recently terraformed planet. If that isn't enough it would have to be done using the bare minimum number of organisms. You cant just randomly seed the planet as some plant species would live and some would die. This would cause in a planet lacking a previously established ecology and unbalanced ecosystem. It might fall into a monoculture and become unworkable for decades if not longer. A good example of this is after the asteroid that killed the dinosaurs hit the fossil record shows the core of North America was inhabited by one type of fern for over 100 years. No other plantlife could penetrate its dense foliage. How would you set up a complete ecology and keep it stable? What is the bare minimum number of species needed to keep a planet's ecosystem stable? How long would each step take? I appreciate anything from the uninformed guess up to divine inspiration. Thx.