Question

a student conducted an experiment to test the movement of a marble through four different liquid substances. looking at the figure designed by the student, what is an error in his experiment?

the type of marble used is not consistent
the type of liquid substances are not labeled correctly
the marbles are not dropped from the same distance
the amount of liquid substances used is not consistent

Explanation:

In a proper experiment to test the movement of a marble through different liquids, variables like the type of marble, drop - distance, and amount of liquid should be controlled. From the figure, the amount of each liquid in the cylinders is different. This inconsistent amount of liquid substances can affect the movement of the marble and introduce confounding variables.

Answer:

the amount of liquid substances used is not consistent