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Differences in strength, hormones, body structure, bone structure. Like when you draw a man figure, the body is usually a rectangle but when you draw a female, the body is an upside down triangle. Hormones like estrogen, only women have. Similarities are intelligence, appearance. Women and Men are treated differently, especially in the work place, because they used to be seen as lower class and we are thought of not being able to do some of the obs that men do, like manual labor because women don't have the same muscle mass or upper body strength as men do but men are also seen as not being able to do some jobs that women do, especially in households, because they don't have motherly instincts or they can't cook as well as women can.
There are multiple reasons. The most simple answer is because the rain that we consider acidic has a low pH; it has a higher amount of hydrogen ions.
Why does this happen? One is because of the release of sulfur dioxide into the environment to which we humans often contributed. However, it is also possible that increased levels of nitrogen oxide would have this effect as well. And nitrogen oxide can be released through lightning or volcanic eruptions, so these are occurences in nature that don't have anything to do with humans.