What Is the Benefit of Using Controls in an Experiment

question 53

Multiple Choice

What is the benefit of using controls in an experiment? ​

• A)The size of the groups can be very large.
• B)The subjects do not need to know anything about the experiment.
• C)The subjects who are treated are balanced against the placebos.
• D)The groups are similar in all respects except for the treatment being tested.

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Definitions:

Nematode

Unsegmented worms of the phylum Nematoda, including both parasitic and free-living species that can be found in various environments.

Ectoderm

The outer germ layer of the early embryo; gives rise to the skin and nervous system. Compare with mesoderm and endoderm.

Protostomes

Animals that belong to the Protostomia, one of the major animal clades. Include the annelids, arthropods, and mollusks. Compare with deuterostomes.

Deuterostomes

A major group of animals characterized by their embryonic development, in which the anus forms before the mouth.