When , pollutes the water supply, the nervous system (brain) can be damaged. O oxygen
O nitrogen
hydrogen
O lead

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

Ithink the answer is c. i’m not sure though i’ll notify you when i have an exact answer!