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What are trees made of?

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If someone asked you where the mass of a tree comes from, what would you say?  Have you ever really thought about it as you climbed through tree branches or walked through a forest? Is it the soil the plant is rooted in, the atmosphere above it, what do you think?  Watch this lesson and find out more!

4. We breathe out _______ and _______ and we lose mass. Trees take in these substances and gain mass.

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