Answer;
-Species selection
-This trend toward species that have live birth in a particular environment is an example of species selection.
Explanation;
-Species selection is the process responsible for the proliferation of species that have lower extinction and higher speciation rates. Species selection is a reason why macroevolution and microevolution may be uncoupled.
-Suppose that larger-bodied species lineages tend to speciate more rapidly, and that the average rate of extinction is also less for larger species. Over time, this will result in a species trend, in which the clade becomes more speciose and each species on average larger.