Science Level 6
Unit 1 Life Over Time.
Our planet Earth is roughly 4.6 billion years old. Over this time periods not only our planet changed, but the life has also changed and evolved. Which organism lived on earth 4 billion years ago? How today’s life is different from past?
In this unit you will learn that how the life on earth has changed and evolved over 4.6 billion years!
Iraj Tanzeem
The world has changed a lot, but one thing has not changed,
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