Hi. I am not sure if there are choices that should be included in your question. In case there are none, let me go ahead and answer this for you. The activity occurred during the Golden Age of Muslim culture was the major discoveries in mathematics and sciences. The Arab World contributed greatly in the modern science and mathematics.
Due to their belief that economic success is the result of human work and that mobility is attainable, Americans have traditionally tolerated significant gaps between wealthy and poor persons.
Mobility is strength throughout a muscle's range of motion. Flexibility and mobility vary in that you can control your range of motion with mobility. For instance, with the help of your arms, you can certainly elevate your leg fairly high.
When you are Mobility, you can lift your leg up on your own without the aid of another person. You can control the whole range of motion of your leg with just your leg muscles.
You can have muscle strength even with a limited range of motion. Since you need to train the complete range of motion to develop mobility, strength alone is insufficient.
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The answer is: A. Fixed Ratio
When reinforcement is set in a fixed ratio, the researchers will already determine how fast a certain type of punishments or reward would be given to the subjects after they are completing a certain type of behavior.
Example of the experiment would be an experiment where the researchers would provide an exact amount of candies for children as soon as they completed the puzzles that are assigned to them (in order to see whether they are more motivated to complete the puzzle or not)