Supernovae are one of the most extreme events in the known universe. They are caused by

A. the collapse of a supermassive supergiant star.
B. the implosion of a white dwarf, which has run out of all its fuel.
C. a supermassive supergiant star undergoing a massive nuclear chain reaction.
D. any of the above


Answer: A

Environmental & Atmospheric Sciences

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The most structurally complex animal phylum is the ____________, in which members possess a stiffening

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Answer the following statement true (T) or false (F)

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