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An even function is symmetric about the y-axis. The graph to the left of the y-axis can be reflected onto the graph to the right. An odd function is anti-symmetric about the origin. The graph to the left of the y-axis must be reflected in the y-axis as well as in the x-axis (either one can be done first).
It is a plane. It has to be to graph even the super huge #
It's difficult to make out enough detail to formulate an answer. Not only can't I see the numbers below the graph, I can't even see the graph.
Usually, the way functions and graphs are presented in most mathematical textbooks, the x axis is the horizontal axis on a graph. So even though it doesn't have to be true, but in your case, it probably is. (As you understand, there is no definite answer to this question, since you can define a graph and label its axes any way you want)
Anything variable that you like. If there is only one independent variable then conventionally that is plotted on the horizontal axis while other variables go on the vertical axis. But even this is not true for population pyramids.