at the end of an experiment,the results must be interpreted as objectively as possible.
sometime they are so clear that it is obvious whether they support or contradict the hypothesis.
ofter,however,results are variable and need statistical analysis before conclusions can be made, the conclusions may lead to the hypothesis being accepted, modified,or rejected.
even if results support hypothesis, it is accepted only tentatively because it can never be proved completely .
however, it only needs a single contrary observation to refute a hypothesis (prove it wrong or incomplete).
a hypothesis is therefore only the best available explanation at any time.
this makes biology a highly dynamic subject and not merely a collection of facts.