Final answer:
A hypothesis must be testable and falsifiable in order for it to be used in science.
Step-by-step explanation:
A hypothesis must be testable and falsifiable in order for it to be used in science. This means that it can be supported or refuted through carefully crafted experimentation or observation. It should be possible to subject the hypothesis to a test that generates evidence for or against it, and observations should have the potential to disprove the hypothesis if it is false.