If adam and eve were the first and only people on earth how did we ger here?

They made babies, if u know wat I mean ;)

Yes they had children, who then had children, who had even more children, and so on.

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.