Answer the questions alongside the text. Whatever branch a scientist is interested in, he observes things and asks questions

1 From asking a well-defined question about nature.2 A possible reason/ answer to the research question.3 For testing the hypothesis.4 A method of investigation used in science which includes three main steps: asking a question, stating a hypothesis, testing it by experiment.5 A standard for comparison with the experimental one. All variables should be the same except for the one for which we want to investigate the effect.