Which statement best describes a problem with tidal and wave energy? a) doesn't impede the tidal flow b) inexpensive to build and maintain eliminate c) may have a negative impact on wildlife d) dangerous elements are found in the oceans

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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