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Verizon [17]
3 years ago
8

Tina asks the question "Does caffeine increase the heart rate of an earthworm?" In Test 1, she measures the heart rate by lookin

g 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
Biology
1 answer:
Greeley [361]3 years ago
7 0
The independent variable is the caffeine.
it controls the bpm.
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