A website's CTA is its call-to-______.
A. advance
B. assess
C. action
D. analyze
Answer: C
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When the surface of the reactive metal titanium is passivated, _________ forms on the surface of the metal.
Fill in the blank(s) with the appropriate word(s).
CO observations of the galaxy reveal
a. the location of dense neutral hydrogen clouds. b. the location of population II stars. c. the location of population I stars. d. the location of the galactic corona. e. the location of giant molecular clouds.
To be dimensionally consistent, velocity [L/T], pressure 
and density 
must be related as follows.
A. velocity = pressure/density
B. 
C. 
D. 
Why do scientists assume that the early universe was much hotter and denser than the universe of today?
A) The fact that the universe is expanding implies that objects were closer together in the past, and compressing material makes it hotter and denser. B) All objects begin their existence in a hot and dense state. C) The fact that the universe is filled with stars and galaxies implies that matter must once have been hot to have made these objects. D) Observations of distant galaxies show that they are much hotter than galaxies of today, suggesting that the whole universe was hotter in the past.