True if one species goes extint then we could lose food from them
Answer:
A controlled experiment is simply an experiment in which all factors are held constant except for one: the independent variable. A common type of controlled experiment compares a control group against an experimental group. All variables are identical between the two groups except for the factor being tested.
Explanation:
A detailed process to test a hypothesis... if its an experiment doesn't that mean you would be testing something? yes! so it would be a process to test something
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