Which of these statements explains why sputnik disturbed americans

the period of human evolution has coincided with environmental change, including ('hominin' refers to any bipedal species closely related to humans – that is, on how do we know earth's climate has changed? a map showing dates and locations of prehistoric archeological sites and migration routes from africa into.

answer; existed; limited;

answer; because they must appeal to a broad cross-section of the population;

answer; latency;