a method of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypothesis.

Scientific method

Explanation:

Scientific method are the series do processes that are carried out by scientists to ensure findings are very accurate.

This methods include observation, experiments. After this methods the hypothesis is usually formulated. The formulated hypothesis is then tested for exceptions and other factors. If any is found the hypothesis is modified to include the new findings and exceptions discovered.

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.