Speed is O B. zero for objects at rest
D. all of the above
C. a measure of how quickly an object gets from one place to another
O A. calculated by dividing the distance traveled by the time taken

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?