List two ways currents affect life on earth.

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Ocean currents regulate the Earth's climate and make up for the difference in solar energy radiation hitting the surface of the planet. As such, water current distributes heat. The ocean absorbs most of the sun's radiation on Earth, in contrast to the atmosphere and to land.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.