Instead of making a clean break, water evaporating from treetops tugs on the remaining water molecules, with that tug extending from molecule to molecule all the way down to the roots.
The plants in these colonies also need tough resilient stems above the soil, stems that can bent a lot but not break as water constantly crashes into them.
这些殖民地的植物也需要坚硬有弹性的茎高于土壤，茎可以弯曲很多，但不会断裂，因为水不断闯入他们。
3
It appears that the shell has to crack open or break down somewhat to allow the seed to soak up water.