The role of a control in an experiment is A. Ensure the experiment can be repeated
B Prove a hypothesis is correct
C Provide a basis of comparison to an experimental group
D Prove that a hypothjesis is correct and ensure repeatability

Reactants are mean lol

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