Question

Alicia would like to determine the effect of epinephrine on a fish's heart rate. Alicia designs the following experiment: Select a fish for the experiment. Measure the fish's heart rate. Inject the fish with epinephrine. Measure the fish's heart rate again. Record the results. In looking at Alicia's experiment, what is wrong? A. She should have tested the effect of other hormones as well. B. She shouldn't have measured the fish's heart rate twice. C. She didn't determine what a fish's normal heart rate is. D. She didn't use a second fish as a control.

Answer 1

I think the answer should be D so she knows what the heart rate was before and what it is later, meaning she should have used another fish as a comparison.

Hope this helps,

:)

Answer 2

She should have used another, second fish as a control, to later on compare both results (of a fish with and of a fish without epinerphine).

Therefore, the answer is D.

Hope it helped,

BioTeacher101