Biology, 15.01.2020 08:31 19alexanderetha

In the same science fair, tina asks the question “does caffeine increase the heart rate of an earthworm? ”
in test 1, she 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.

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