<span>The oldest people in the population may be much older than the average life expectancy due to the more quality food source in the area. The addition of modern medicine, also, drastically helped provide longer life expectancies for many of the people.</span>
<span>this theory is referred to as: Transformation
In choosing an economic system, transformation refers to creating an adjustment to an existing economic system, by taking the positive aspects of other existing economic system.
For example, a communist country that choose to give more freedom to the private sector in order to attract economic growth</span>
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Prime numbers are numbers that are only divisible by 1 and themselves. So, to tell if a number is prime, look at its factors.
19:
1 x 19
29:
1 x 29
39:
1 x 39
3 x 13
So, because 39 has more than one set of factors, it's NOT a prime number.