Can you please put the graph in the question so I can see it?
Acids have a pH level power than 7. Water is usually close to 7 pH, but it is usually diluted because of various factors. I'm assuming you mean the pH of the sample was 5.4? This would make more sense. The acid rain would lower the average pH because the rain has a pH less than 7. The rain's pH will also be less than 5.4 because it would need to average with the waters previous pH to get this number.
Evoultion is the change of the allele frequencies and the inherited traits of a population over time.
The idea of evolution is that the species change over time. The proposed mechanism of evolution is natural selection. Natural selection favors inheritable trait, suitable for survival and reproduction. Organisms with such traits will tend to leave more offspring than others, and thus will evolve over time.
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Are there options to chose from? Like multiple choice answers?? If So, I can try and Answer for you :)
