It began in the year 1941
Answer:
<h2><em><u>C. Civil war </u></em></h2>
Explanation:
<em><u>The American Civil War from April 12, 1861 to May 9, 1865,</u></em> was a civil war in the United States fought between northern and Pacific states ("the Union" or "the North") and southern states that voted to secede and form the Confederate States of America ("the Confederacy" or "the South").
B <span>It was a dangerous mistake to spend so much time on Alcatraz Island, and it damaged the landmark
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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.
