Roots

That makes it clear from the start where something comes from, which underpins it. 
Unlike humans and animals, who move around and make it difficult to pinpoint their origins, plants remain in one spot for the duration of their lives. 
It's possible that humanity will always seek to understand its origins and why it exists. 

Just lacking roots and a light breeze could cause something to be carried away.
Can people as well as plants fall under this?
Roots
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Roots

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