What are the factors that determine

the level of harm an introduced chemical

has on the enviroment?

PLEASE ANSWER QUICKLY

Ithink it’s c or b for the answer.

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