Which of the following best describes how thermal pollution from power plants can affect aquatic ecosystems?
~Water injected into the ground during the hydraulic fracking process can seep into wells, causing methane contamination.
~Warm water runoff that reaches lakes and ponds slows down the metabolic rate of aquatic animals, which decreases primary productivity.
~Warm water discharged into rivers and streams decreases the oxygen content of the water, which reduces the number of fish species.
~Wastewater from nuclear power plants contains radioisotopes and carbonic acid, which increase the rate of cancer in aquatic species.

On a certain portion of an experiment, a statistical test result yielded a p-value of 0.18. what can you conclude? 2(0.18) = 0.36 < 0.5; the test is not statistically significant. if the null hypothesis is true, one could expect to get a test statistic at least as extreme as that observed 18% of the time, so the test is not statistically significant. if the null hypothesis is true, one could expect to get a test statistic at least as extreme as that observed 82% of the time, so the test is not statistically significant. 0.18 > 0.05; the test is statistically significant. p = 1 - 0.18 = 0.82 > 0.05; the test is statistically significant.

How do astronomers measure the amount of dark matter in the universe

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