The Permian period experienced major extinctions, which may have been due to

A) global warming.
B) the emergence of the reptile.
C) the breakup of Pangaea.
D) the formation of Pangaea.


Answer: D

Physics & Space Science

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If two adjacent frequencies of an organ pipe closed at one end are 385 Hz and 578 Hz, what is the length of the organ pipe? (vsound = 340 m/s)

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A jar filled with gas is placed directly in front of a second jar filled with gas. Using a spectroscope to look at one jar through the other you observe dark spectral lines. The jar closest to you contains

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