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Biology, 22.10.2021 21:00 tyryceschnitker

(b) Mike and Rajiv plan an investigation to find out how running speed affects breathing rate. (i) Name the equipment they must use to measure their breathing rate.
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(i) State one variable they need to change.
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(ili) State one variable they need to keep the same.
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(iv) Suggest one way they record and present their results.
[11

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