Question

question 20
what makes an experiment more reliable?
changing multiple things at once
using complicated equipment
using fewer variables
repeating the experiment multiple times

Explanation:

Repeating an experiment multiple times helps to account for random errors and variations, increasing the reliability of the results. Changing multiple things at once makes it hard to determine what caused the results. Using complicated equipment doesn't necessarily mean more reliability. Using fewer variables is related to experimental control but not as directly to reliability as repetition.

Answer:

Repeating the experiment multiple times