What three factors are needed for natural selection to occur? Check all of the boxes that apply.
isolation
variation
overpopulation
O
adaptation

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

Where are the following choices

Ther are many reasons.. is it a multiple choice?