Biology, 24.08.2021 19:10 sophiapknight

In the same science fair, Tina asks the question "Does caffeine
increase the heart rate of an
measures the heart rate by looking at the earthworm under a microscopes,
the earthworm has a heart rate of 50 bpm (beats per minute). In Test 2, she
places a few drops of caffeine on the earthworm's skin and measures the rate
again. In this test, the heart rate is 68 bpm.
earthworm?"

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In the same science fair, Tina asks the question "Does caffeine
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