Where Do Trees Get Their Mass?

Last week we saw a video that asked us what happens to the mass you lose when you lose weight.

This week we look at the reverse. Where does the mass come from when a tree grows?

It's a remarkably similar answer because generally, reactions are reversible.

This question is incredibly subtle, and not even high-level science students get it right...



As a side note, I can see through Dr Derek at about 3:50.