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Use the following information to answer the questions below.
Theodor W. Engelmann illuminated a filament of algae with light that passed through a prism, thus exposing different segments of algae to different wavelengths of light. He added aerobic bacteria and then noted in which areas the bacteria congregated. He noted that the largest groups were found in the areas illuminated by the red and blue light.
-An outcome of this experiment was to help determine
Experiments
A method of scientific investigation involving the manipulation of variables to test a hypothesis and observe the effects, often used to establish cause-and-effect relationships.
Representative
Someone or something that serves as a typical example of a group, class, or quality.
Experimenter Effects
Unintended influences that the experimenter's presence or actions may have on the results of an experiment.
Single-blind Studies
Experimental studies in which the participants do not know which experimental group they belong to (e.g., control or treatment), but the researchers do.
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