Most weather conditions occur only in the troposphere (true or false)

True. This is where most clouds are located and planes fly about this high.

True. The jet stream is there that causes most weather to occur

It is used to during sexual reproduction between humans

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