Comment by mr_mitm

There is the Hoyle state, a peculiar resonance state that is very important for nucleosynthesis. Without it, stars would not produce a lot of carbon. It appears to be finely tuned for complex chemistry and thus life to evolve.

Wikipedia says the the strong force must be within 0.5% of some value and the finestructure constant within 4%: https://en.wikipedia.org/wiki/Fine-tuned_universe#Carbon_and...