Fact 1: Lakes are generally bigger and deeper than ponds.

Fact 2: Some of the best work in ecology has been done on small fresh water pond ecosystems.

Given the two facts above, answer the question "What are generally bigger and deeper than small fresh water ecosystems?" with the following options: 
- puddles
 - wetland
 - complex
 - streams
 - lakes
 - rivers
 - creeks
 - fens


 

     lakes    