Cause and Effect:\nI) Migratory birds have stopped coming to the lake on the outskirts of the city.\nII) The lake has the highest water level in almost a decade and a large fish population.

Introduction / Context:
The pair juxtaposes an ecological behavior (migration absence) with favorable lake conditions (high water, abundant fish). The task is to determine if one explains the other or if both arise from different causes.

Given Data / Assumptions:

• I: Migratory birds have stopped arriving.
• II: Lake conditions appear ecologically favorable (water level, fish).
• No explicit causal link is given.

Concept / Approach:
If II were the cause, we would expect more birds, not fewer. Conversely, if I caused II, bird absence does not explain higher water and fish. Therefore, it is most consistent that both are effects of separate causes (e.g., I: altered flyways/climate elsewhere; II: heavy rainfall, water management, stocking).

Step-by-Step Solution:
1) I → II is not sensible: absence of birds does not increase water levels/fish magnitude.2) II → I is counterintuitive: better habitat usually attracts, not repels, migratory birds.3) Hence treat both as effects of independent drivers.

Verification / Alternative check:
Typical exam logic prefers the independent-effects choice when causal directions are either perverse or unsupported.

Why Other Options Are Wrong:
They assert causality where none fits the ecological intuition or the text.

Common Pitfalls:
Assuming any two concurrent ecological observations must be directly linked.

Final Answer:
If both statements I and II are effects of independent causes