An intervening variable facilitates a better understanding of the relationship between the independent and dependent variables when the variables appear to not have a definite connection. They are studied by means of operational definitions and have no existence apart.
Difference between Microevolution and Macroevolution. â¢ Micro evolution refers to visible changes in a population of the same species over a period of time. â¢ Macroevolution is what evolution is as described by the theory of evolution by Darwin.
Thus growth can be measured most of the time whereas development may or may not be capable of being measured. Growth takes place within a limited scope of time whereas the scope of development is quite vast. This becomes especially true when it comes to the growth and development of an individual.