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2. The learners then wanted to investigate whether exercise has an effect on heart rate. 2.1. Formulate a hypothesis for their investigation.
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2. The learners then wanted to investigate whether exercise has an effect on heart rate.

2.1. Formulate a hypothesis for their investigation.

User Miroxlav
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1 Answer

4 votes

Answer:

b

Step-by-step explanation:

User Erekalper
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