You are presented with the question "what is forced against a seed coat causing the root to emerge?" and the following answer choices: 
- thorns
 - H2O
 - weathering
 - rain
 - CO2
 - H20
 - flow
 - urea

Now knowing 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, choose the best answer.


 

  H2O       