Question

Some theories are developed from repeated testing of a single hypothesis. Cell theory, germ theory, and the theory of evolution all have developed from the testing of multiple related hypotheses. Which statement best explains why some theories develop this way?
A hypothesis tests many variables at once, which can lead to new hypotheses.
Multiple related hypotheses will become theories before a single hypothesis does.
Each scientist has used different wording when developing his or her hypothesis.
Each experiment reveals a different piece of information that is needed to develop the theory.

Answer 1

Each experiment reveals a different piece of information that is needed to develop the theory.

Complex scientific theories explain broad, multifaceted phenomena, so researchers test many related hypotheses that each provide a different piece of evidence. Together those pieces build a well-supported, comprehensive theory (as with cell theory, germ theory, and evolution).