Which two salamander subpopulations would be least likely to reproduce successfully if brought together?

He should put sand around the spill in order to contain it so that it won't spread

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11