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The answer is B <span>Hiding in the tree fort he had built as a kid. :)</span>
It is <span>informal language used in a specific location, for I recently um, "learned" this in "class" so yeah go with B.</span>
<span>The Doppler effect is a shift frequency. If the frequency is lowered this is called a redshift (the opposite is called a blueshift). The redshift is said to support the expansion of the Universe , a tenant of the Big Bang theory.
Hope this helps
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