The most massive galaxies in the universe are
A) ellipticals.
B) spirals.
C) lenticulars.
A) ellipticals.
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Determine the shape factors between the three surfaces A1, A2, and A3 indicated in the figure.
In a sequence of rock layers we find trilobite fossils at the bottom of rock layer 1 and dinosaur fossils directly above the fossil trilobites in layer 2. There are inclusions of trilobites in layer 2. We conclude that
A) dinosaurs were extinct long before trilobites came into existence. B) dinosaurs are from the Cambrian Period. C) by inclusion and faunal succession, layer 1 is older than layer 2. D) there is no time gap between the rocks.
The electrical conductivity of an intrinsic semiconductor is due to the creation of free electrons in the conduction band and _________in the valence band.
Fill in the blank(s) with the appropriate word(s).
What spectacular development in organisms marks the beginning of the Paleozoic era?
What will be an ideal response?