Suppose You Are Studying Two Small Lakes (Lake 1 and Lake

Multiple Choice

Suppose you are studying two small lakes (lake 1 and lake 2) and how they change over time. A nearby farm accidentally spills fertilizer into lake 1. Around the same time, a non-native fish-eating turtle is introduced into lake 2. The ecosystems of both lakes are affected by these changes. What processes most likely explain how the lakes were affected?

A) Bottom-up control in lake 1; top-down control in lake 2
B) Top-down control in lake 1; bottom-up control in lake 2
C) Top-down control in both lakes
D) Bottom-up control in both lakes