The force of water against the seed coat causes a root to emerge from a seed, and water is made up of H2O molecules. Given these facts, what is forced against the seed coat to cause the root to emerge from a seed among the following options:
- germination
 - UV
 - urea
 - h2o
 - sunflower
 - rain
 - oil
 - newtons


 

    h2o     