Five different students in Mr. Garcia's class have done an experiment once, and each one got similar results. What should the students do to increase the validity of their results?

A. Each student should do a few more experimental trials.

B. The students should ask Mr. Garcia for a different experiment to do.

C. The students should compare their procedures and try to revise them.

D. Each student should modify the experiment and see what results they get.

To increase the validity of the results, all the students of Mr. Gracia's class must perform a few more experimental trials.

 A

Explanation:

While dealing with the scientific analysis, one must always commit number of experiments to gain the most accurate and valid result. By doing number of trials, we get different approximate values that can be used to estimate the average result.

This average will be the nearest value of the exact answer if we add more and more number of experiments or trials. Since, the results are similar for each student in the class, they all should attempt more trials or experiments to get the most accurate result.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.