Question: The Danube and Volga rivers both form large deltas, but the Danube river delta is larger and grows faster every year. Which river flows into a sea with stronger tidal currents?
Answer: Danube

Question: Two friends, John and Abe, worked at the same warehouse. John was exposed to very strong light all the time, while Abe worked in a more normal environment. John started experiencing health problems after a while. Which friend worked in a less healthy work environment, John or Abe?
Answer: John

Question: Dan and Joe studied animals for biology class. Joe had to study predator animals, while Dan studied herbivores and grazers. Which student learned more about the balance of organisms in an ecosystem?
Answer:
Dan