Based on the graph the region expected to have the least population growth will be Australia.
<h3>Graphical illustrations</h3>
Looking at the given graph the population size of each region starts at a lower point and ends at a higher point on the graph between the years 1950 and 2050.
The change in the population also varies depending on the scale on the y-axis. Australia has the lowest scale which lies between somewhere above 10 and 50.
More on graphical illustrations can be found here: brainly.com/question/21376268
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I would say your answer is temperature... as it is the measure or degree of heat present in a substance or object, but because I can't see your list of options, I can't be certain.
Hope this is somewhat helpful!