Explanation:
Terms in this set (44) What is the difference between New and Old immigrants? Old immigrants came to the U.S. and were generally wealthy, educated, skilled, and were from southern and eastern Europe. New immigrants were generally poor, unskilled, and came from Northern and Western Europe.
<span>The correct answer would be
Martha Jones</span>
<span>A major contribution was the establishment of hospitals, the educating of physicians was well structured, and physicians were meticulous with their record keeping to spread knowledge. Al Razi's great achievement was understanding the nature of illness. He also understood how the brain and nervous system operated muscles.</span>
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.
