D.) Is the most sensible answer.
Explanation: I used the process of elimination to solve this. Groundwater recharge sounds too far off of the topic, snow melt is...well...melting snow, infiltration also has nothing to do with the subject, but surface runoff is the only one that makes sense, is on topic, and seems to have a meaning similar to the occurrences describes in your question.
Shrubs is the best answer ;)
Answer:
D
Explanation:
For more info, try specifically researching about synapse junctions
Atom, molecule, cell, tissue, organ, and organ system
