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....
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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
created from data collected over a long period of time
Yes, because they must be clearly stated so that they can be tested.