A student conducts an experiment to determine how the amount of water given to a plant affects its growth. Which of the followin
g is not a constant or control for this experiment?
a. the type of plant
b. the amount of soil
c. the amount of water
d. the amount of time in the sun
Please select the best answer from the choices provided A B C D
1 answer:
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Hello!! The answer would be A - The SA node. It is known as the "pacemaker" because it initiates the heart's rhythmic contractions. I hope I helped!! Have a great day. :)
