(D) It uses enzymes to liquefy food and kill bacteria to be further digested in the intestines.
Answer:
Radio waves, microwaves, infrared and visible light can all be used for communication.
Control group
Explanation:
The control group usually serves as a reference for comparison during a scientific investigation.
What is a control group?
- The control group is an experimental group not being tested for.
- it does not receive any modification or design from the scientist.
- It is designed as a reference for the main experiment
- Often times, it is isolated from the main experiment and the independent variables cannot influence the outcomes of the experiment.
Learn more:
Controlled experiment brainly.com/question/1621519
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