Driving cattle on the cattle trails was very hard work in hot, dry locations. Which incentive did people have to do this difficult work?.

The object would have to be spherical, orbit the sun, and be traveling in a path with other objects.

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.