Answer the following question: You are presented with the quiz "What are generally bigger and deeper than small fresh water ecosystems?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "lakes are generally bigger and deeper than ponds" and "some of the best work in ecology has been done on small fresh water pond ecosystems". So, what's the best answer to the question?

Select from the following.
A). puddles
B). wetland
C). complex
D). streams
E). lakes
F). rivers
G). creeks
H). fens
Answer:
E).