What is the difference from a control group and a control variable?

A control variable is a scientific experiment in which the experimental element is unchanged throughout the experiment

a control group is a group in an experiment that does not receive the treatment by the researchers (untouched by them) and used to see the changes between the controlled group and that of the group that received the vial

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The given question is incomplete as it lacks the options required to answer the question, however, options for the question is as follows:

A. Photosynthesis

B. Cellular respiration

C. both A and B

d. None of the above

The correct answer is - option A. cellular respiration.

Explanation:

Plants produce their food or glucose with the help of the photosynthesis process. Plants called autotrophs as they generate their food on their own whereas animals depend on plants and other animals for their food and energy.

Plants and animals both perform cellular respiration in order to convert the food or glucose to the useable energy form that is known as ATP. Cellular respiration converts glucose into energy and releases carbondioxide and water.