It means a condition resulting from an unbalanced diet or insufficient food
Ungrammatical usage. The grammar is incorrect. it should be written: "I haven't SEEN him" Mark me brainliest plz! good day :D
Answer:
(3) control group
Explanation:
Control group refers to the group of standar individuals who do not receive treatment by researchers, so that their results are compared with the experiential group which did receive treatment.
In the experiment about pulse rate according to music, the student does not include the average pulse rate of the control group that was not exposed to different types of music.
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