Examlex
If a between-subjects study explores the effect of caffeine on appetite by comparing the appetites of teenagers with no caffeine in their systems with middle-aged adults with 100 mg of caffeine in their system, the study is ________.
Ingestion
The act of taking food, drink, or another substance into the body through the mouth.
Lymph Nodes
Small, bean-shaped structures that are part of the mammalian immune system, filtering lymph and trapping pathogens.
Respiratory System
The biological system in animals and humans consisting of organs used for the process of respiration, including the lungs and airways.
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