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Vikentia [17]
3 years ago
13

From the last question! which of the following is the independent Variable In experiment A: The presence of the headache B: the

experimental drug C: The placebo D: the medical researcher.
Biology
1 answer:
strojnjashka [21]3 years ago
7 0

Answer:

B

Explanation:

The experimental drug has a direct effect on the dependent variable which is the presence of the headache.

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