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# SC: Cretaceous Period

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Senior Manager
Joined: 31 Jul 2006
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01 Oct 2006, 20:33
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so guys I know that answer is either D or E.

How can you tell whether it's the event (asteroid hitting the earth) or the extinction of the animals/plants that marks the end of Cretaceous Period.

This was the difference of right and wrong for me and I don't know what strategy to use on exam when I face a question like this!! please help!
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VP
Joined: 21 Aug 2006
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01 Oct 2006, 20:53
what marks the end of Cretaceous period?

D says "slamming"

E says "extinctions"

I say D is right. My answer is D.
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Senior Manager
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02 Oct 2006, 06:25
Looks like D.

Guys, OA is E!! sorry for not being clear from beginning.

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VP
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02 Oct 2006, 06:49
E seems the answer. Extinctions only can mark the end of a period.
_________________

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02 Oct 2006, 07:05
ak_idc wrote:
E seems the answer. Extinctions only can mark the end of a period.

I don't know.. what if some animals/plants go extinct today without the meteor, would we mark an end of period, or would we mark it only when one definite catastrophe occurs.

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02 Oct 2006, 07:24
Nsentra wrote:
ak_idc wrote:
E seems the answer. Extinctions only can mark the end of a period.

I don't know.. what if some animals/plants go extinct today without the meteor, would we mark an end of period, or would we mark it only when one definite catastrophe occurs.

Meteor slamming the earth was a major event because of extinctions. If extinctions did nt happen after slamming, then we can hardly say that slamming marked the end of that period. The significance to slamming came because of extinctions. Hence extinctions could have marked the end of period.
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02 Oct 2006, 07:24
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