Biology, 22.09.2019 06:30 beserkerbradley7985
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. the independent variable is
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Tina asks the question "does caffeine increase the heart rate of an earthworm? " in test 1, she meas...
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