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2,038,977 results
This 3D animation shows you how DNA is copied in a cell. It shows how both strands of the DNA helix are unzipped and copied to ...
11,292,982 views
8 years ago
Chapters: 0:00 Intro 0:20 Viking Hair Colour 0:55 How Tall Were Vikings? 2:26 Female and Male Facial Structure 3:02 Viking ...
12,666 views
1 year ago