What happens when two moving objects collide?

Which of the following is not a main characteristic that scientists focus on when determining which kingdom an organism belongs to

Robert wants to know which fertilizer will work the best for his grass. what can he do to explore this inquiry?

During an experiment, readings for blood pressure in a persons body were found to be constant . however , when he measured by a different blood pressure cuff , the readings differed by 15 points for each reading. this difference indicates that the results are