scientists knew that oxygen was a element as it had the atoms of only O i,e. oxygen and helped in increase in combustion
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Because all of the observations and evidence are used for support.
At what point will scientists gain confidence in a new hypothesisType your answer here...
Scientists learn a few different things. Scientists learn new things very day.
The scientists often revise the hypothesis.
Learning and studying the basics,theories,applications and the latest discovered knowledge of the field. And learning about the new thoughts that scientists exploring now. finally , you should join or work close with some scientists or experts in the field developing your new experiments and theories and checking it.