Heat flow will NOT occur without . A. a force due to gravity

B. a difference in temperature

C. air being present in the room

D. an object with a temperature over 100 °C

More; less is the correct 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

Tell the option first