The ancient Greeks get a lot of attention for their contributions to science because ________
A) they were the only ancient culture that kept written records of their astronomical observations
B) they were the first people to realize that Earth is a planet orbiting the Sun
C) they were the first people known to try to explain nature with models based on reason and mathematics, without resort to the supernatural
D) the books of every other culture were lost in the destruction of the library of Alexandria
C
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A heat pump is used to heat a house in Minnesota in the winter and has half the ideal coefficient of performance for a reversible heat pump. If the outside air temperature is 
and the indoor temperature desired is 
what is its coefficient of performance under these conditions?
A. 3.7 B. 1.1 C. 2.0 D. 4.2
How do humans use their eyes to measure relative distance by parallax?
a. By continuously focusing our eyes on distant objects, we can determine distance. b. Since our eyes are separated, the brain interprets the relative look angles of these eyes in terms of distance to the object viewed. c. Our eyes can measure the time it takes light to travel from an object and from this we get distance. d. By moving our heads from side to side our brain compares look angles from each of these positions to obtain the distance to the object viewed.
What are the dark blobs (indicated by the red arrows) in this photograph from the Hubble Space Telescope?
A) cold, dense molecular clouds in which stars are forming B) warm atomic hydrogen gas, much like most of the gas in the galaxy C) tall interstellar bubbles blown out by supernovae or stellar winds D) jets of hot gas shot out from young binary star systems
Our universe will end in a big crunch
Indicate whether the statement is true or false