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by spirates
Thu Nov 01, 2012 7:10 am
Forum: General Discussion
Topic: Help!
Replies: 1
Views: 1367

Help!

any biologi pros here that want to help me with my Zoologi homework which i totally forgot about so i wont fail :<? Starting with the strangest question i dont understand at all..

What are the oldest biological structures we can see with our eyes? What organisms produce them?