Answer:
Genetics.
Explanation:
Over time animals and plants of all sorts have evolved into several different things. there is no limit to the differences that can exist, as life is ever changing.
The principal reason for the economic boom in the United States after the Second World War was a shortage of consumer goods combined with a reserve of purchasing power in the form of accumulated savings.
The problem 3 + 6 = 9<span> demonstrates the closure property of real number addition.</span>
Observe that the addends and the sum are real numbers.
The closure property of real number addition states that when we add real numbers to other real numbers the result is also real.
<span>In the example above, 3, 6, and 9 are real numbers </span>
Papa Roach.
I used to love these guys!! (: