Lea Katherine Acera  wrote:

> hello everyone!!! i hope anybody can help me look for the answer
> (directly or indirectly) to this question that our professor has given
> us as our internet research assignment: "When did different lineages
> of true crabs arise in the evolution (in a geological time scale)?". I
> believe this newsgroup has millions of readers with different
> backgrounds so I am optimistic that I can read your response as soon
> as you have an idea on what I am asking. Thank you in advance!!!

You've already been given useful pointers in talk.origins. Do your own
homework.
-- 
Dr John S. Wilkins, www.wilkins.id.au
"I never meet anyone who is not perplexed what to do with their
 children" --Charles Darwin to Syms Covington, February 22, 1857
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