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Hey guys, So I have the lecturer that looks like Santa Claus for Differential Calculus and just don't know how I should study or take notes in his lectures. The lectures tend to be quite rushed towards the end, and I also find that what we copy off the board are much more complicated/difficult...

So I read in some Bio books that the wall of xylem is lignified and therefore impermeable to water. But then as the pressure flow theory (which explains for the movement of materials in phloem) states that when the source is loaded with sugar, water is drawn in from the xylem by osmosis. I...