Acomet develops a coma because of
a.
gravity
c.
the oort cloud
b.
earth's atmosphere
d.
heat from the sun

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A comet develops a coma because of heat from the Sun (d).

The coma, that nebulous envelope that forms around the comet, appears when it passes very close to the sun, being heated and influenced by its heat.

2. x2 + 8x + 12 = 0 to prove: x = -6 or x = -2

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