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C. The process of evolution
Answer:
Why did Diocletian divide the empire into two sections?
Explanation:
He thought that dividing the empire would make it easier to rule. ... The soldiers hired on the frontiers were not willing to go defend other parts of the empire. Soldiers in the outer parts of the Roman Empire often supported local commanders instead of the emperor.
The amount of rain falling on the cactus plants.
Answer: Option C
<u>Explanation:</u>
Here, the independent variable is the amount of rain that makes the cactus plant grow taller. Control is treated the same as all the rest of the samples, except that it is not exposed to variables that are influenced.
In most experiments, it is important to perform a trial with the independent variable, at a special locale for comparison with the other trials.
The control group consists of all trials where the independent variable is left in its natural state. These trials provide a basis for comparison and ensure that any changes observed in the height of cactus plant are in fact caused by the amount of rain.
