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.
The definition of macroevolution is a large-scale change in the evolution of a species. An example of macroevolution is when feathers appeared on some dinosaurs evolving into birds. large-scale and long-range evolution involving the appearance of new genera, families, etc. of organisms.