A heat engine is designed to do work. This is possible only if certain relationships between the heats and temperatures at the input and output hold true. Which of the following sets of statements must apply for the heat engine to do work?.

Saul's excuse for his disobedience was: 1. he saved the sheep and oxen to feed the nation of israel. 2. the people spared the sheep and oxen to give as a sacrifice to the lord. 3. he didn't hear samuel's instructions to completely destroy the amalekites. 4. he wanted to show mercy to agag, the king of the amalekites.

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Summarize the work of famous environmental scientists of the past.