You are presented with the quiz "what is forced against the seed coat to cause the root to emerge from a seed?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "the force of water against the seed coat causes a root to emerge from a seed" and "water is made up of H2O molecules". 

So, what's the best answer to the question?


 

    h2o       