after observing that fish live in clean water but not in polluted water, researchers state that "polluted water kills fish." This statement is an example of a (n) A. observation B. theory C. prediction D. fact E. hypothesis

Answer: E. hypothesis

Explanation:

A hypothesis can be define as the predicted statement for a particular event or phenomena which includes some facts based on limited evidences obtain from observations. A hypothesis can be tested on the basis of experimental procedures.

The given statement is hypothesis, this is because of the fact that it is based on observation of clean and polluted water influencing the life of fish. This statement can be proved true or false based on experimental procedures.