Question

Marissa is testing a hypothesis through experimentation. She believes that immersing ocean coral in carbonic acid will slow the coral’s growth. Which of these actions will prevent Marissa from introducing confounding variables into her experiment?
A.
She releases cement particles into a random number of the coral samples.
B.
She uses three different types of coral to establish her dependent variables.
C.
She treats the coral samples identically with varying levels of carbonic acid.
D.
She obtains her coral samples from coral reefs surrounding different continents.

Answer 1

She treats the coral samples identically with varying levels of carbonic acid is the actions that will prevent Marissa from introducing confounding variables into her experiment.

What is the explanation of the except?

She disperses cement into a haphazard assortment of the coral samples. This is unregulated, and it's never a good idea to use a random number for anything in an experiment.

She establishes her dependent variables using three distinct kinds of coral. Use only one dependent variable in an experiment at a time because different varieties of coral might respond to the acid differently.

Thus, option C is correct.

For more details about explanation of the except, click here:

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