PL HEL Though some indications of frozen water have been found on Mars, and it can reach habitable temperatures in some places, no evidence of life has ever been found. Which of the following is most likely the reason Mars does NOT support life?
A. The composition of the atmosphere is not suitable for life.
B. The gravity on Mars is not strong enough to support life.
C. There is not enough sunlight to allow plants to grow.
D. The soil on Mars contains too many acidic salts.

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

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warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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