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to be useful in sciences a hypothesis must be
Yes. The data must not be allowed to influence the choice of the hypothesis.
to make a hypothesis must include if the and then the ex. if the salinity of the water increases then the more brine shrimp will hatch
Yes, because they must be clearly stated so that they can be tested.
You must have something to predict upon for instance 'what will happen when we add flour to vinegar?'You need to predict what will happen by starting with :If....then....because.If we add vinegar to flour then.... because....