Which of the following statements describes the air temperature on a cold morning when you see your breath?
A. It can be above or below freezing.
B. It must be above freezing.
C. It must be below freezing.
D. It must be equal to the relative humidity.
Answer: A
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Indicate whether this statement is true or false.
Referring to the figure below, which of the following accurately describes the air temperature and dew point at A and B.
?
A. The temperature and dew point are both colder at A compared to B B. The temperature is colder and the dew point is higher at A compared to B C. The temperature is warmer and the dew point is lower at A compared to B. D. The temperature is warmer and the dew point is higher at A compared to B.
What compound do astrobiologists consider to be the most essential for the evolution of life?
A) methane, CH4 B) water, H2O C) carbon dioxide, CO2 D) oxygen, O2
Which of the following is found in all complex lipids?
A) a fatty acid B) glycerol C) phosphate D) all of these