I. The Migratory birds have stopped coming to the lake on

I. The Migratory birds have stopped coming to the lake on the outskirts of the city.
II. The lake has the highest water level in almost a decade and a large fish population.

1. If statement I is the cause and statement II is its effect
2. If statement II is the cause and statement I is its effect
3. If both the statements I and II are independent causes.
4. If both the statements I and II are effects of independent causes.
5. If both the statements I and II are effects of some common cause.

Both are effects. If II were a cause, then migratory birds would have come to the lake.