Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: The sum of the masses of the atoms in the formula is referred to as molecular mass.

Answer: The sum of the masses of the atoms in the formula is referred to as what?

Question: Ecological pyramids can demonstrate the decrease in energy, biomass or numbers within an ecosystem.

Answer: What can demonstrate the decrease in energy, biomass or numbers within an ecosystem?

Question: To increase the likelihood of accurate experiment results do scientists perform multiple trials of the same experiment.

Answer:
Why do scientists perform multiple trials of the same experiment?