Answers

2015-10-11T14:14:39+08:00
It will die because the area where the comet or asteroid crashed contains a lot of harmful chemicals
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2015-10-12T11:30:21+08:00
The plants and animals will be destroyed because of the impact and due to heat as it landed on the suracae, the heat is produce d by friction between air particles and the fast moving object in the atmosphere.

note: I think there is no possibility that a comet will crash because it has its own orbit
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