Webpage collect information into ______, which are searchable records that companies can use for mailing lists, tracking purposes and more.
A. files
B. repositories
C. forms
D. databases
Answer: D
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This photo shows the famous Crab Nebula. What is it?
A) an expanding cloud of remains from a star that died in a supernova B) a classic example of a planetary nebula C) a star that is right now undergoing a supernova explosion D) a star forming cloud that will eventually give birth to hundreds of stars
If we could see our own galaxy from 2 million light-years away, it would appear ________
A) as a faintly glowing band of light stretching all the way around the sky B) like a single, dim star C) as a flattened disk with a central bulge and spiral arms D) to fill the sky with widely spaced stars
The theory of matter waves was first developed by
a) Heisenberg b) Einstein c) Schrödinger d) de Broglie
A Trombe wall in a house uses a large window and ______
a. R-19 insulation in the walls b. a vertical thermal mass across the room from the window c. a vertical thermal mass close to the window d. a slate floor by the window e. a vertical flat plate collector using water