No such graphs exist. Kangaroo populations fluctuate widely with the seasons, with droughts and floods. It should be remembered also that there are over 60 species of kangaroos in Australia, and populations of each species vary.
Data for the Red Kangaroo and Grey Kangaroo in just one region of New South Wales are available at the related link below, but it is not available in a graph. It is a trend that would be repeated in many places around Australia, but which would vary greatly with the states and the season.
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Line graph
sometimes I guess but they would be weird if you were trying to show them to your partner.
Time Series.
In my experience line graphs are powerful in science because of the relationship they show between two variables (showing how one variable changes as the other changes). But, more importantly in my view they allow the derivation of fomulas. For example, the formula v=u+at can be derived (notice the similarity to the equation of a line, y=mx+c) by drawing a graph showing speed against time.
No matter how many coins are thrown, the possibility of having AT LEAST ONE 'head' is 50%. This changes if you specify the number of 'heads' that must be shown.