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434,937,178 results
About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure.
1,049,912 views
5 years ago
Table of Contents: Video Intro 00:00 Intro to Heredity 1:34 What is a trait? 2:08 Traits can be influenced by environment 2:15 DNA ...
4,529,606 views
6 years ago