What is the purpose of a scientific theory? a to understand the process of controlled experiments b to make a guess at why something in nature happens c to describe how nature behaves in certain circumstances d to give a broad explanation why nature behaves the way that it does

D. To give a broad explanation of why nature behaves the way that it does

They describe the causes of a particular natural phenomenon and are used to explain and predict aspects of the physical universe or specific areas of inquiry (for example, electricity, chemistry, and astronomy).

make flash cards, or have a 'study date' with your friends or something! always works for me! : d

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.