When bernard leaves he asks the pilot if lenina will be safe the pilot responds safe as helicopters what does he mean?

This line is from Aldous Huxley's 'Brave New World'. In this scene, the pilot could be commenting on the safety of helicopters as compared to the safety of being "high" as in flight versus high on Soma. In this case, the metaphor of the helicopter (it being relatively safe, but seemingly very dangerous) is the same for Lenina being high on Soma. She is relatively safe, yes, but produces much fear. This phrase could also be pure sarcasm, in which case the pilot is saying they are not at all safe as helicopters are dangerous.

It might. it might because if you think about if they discovered if we came from (lets say something funny like aliens) and thy found cells that matched and they would have t do more research about it but would most probably change their theory.