[David Attenborough] 
All life is related 
And it enables us to construct with confidence 
The complex tree that represents the history of life 
Our planet, the Earth, is as far as we know 
Unique in the universe; it contains life 
Here plants and animals proliferate in such numbers 
That we still have not even named all the different species 
Darwin's great insight revolutionized the way in which we see the world 
We now understand why there are so many different species 
[Carl Sagan] 
Every cell is a triumph of natural selection 
And we're made of trillions of cells (Within us is a little universe) 
Those are some of the things that molecules do 
Given four billions years of evolution (We are, each of us, a multitude) 
Now how did the molecules of life arise? 
[Attenborough] 
It began in the sea 
Some 3 thousand million years ago 
Complex chemical molecules began to clump together 
These were the "seeds" 
From which the tree of life developed 
They were able to split, replicating themselves 
As bacteria do 
[Sagan] 
The secrets of evolution 
Are time and death 
There's an unbroken thread that stretches 
From those first cells to us 
(refrain) 
[Jane Goodall] 
There isn't a sharp line dividing humans 
from the rest of the animal kingdom 
It's a very wuzzie line 
It's a very wuzzie line, 
and it's getting wuzzier 
All the time 
We find animals doing things that we, 
In our arrogance, 
Used to think was "just human" 
(refrain) 
[Attenborough] 
Its continued survival now rests in our hands