That is a poorly formed question since there are several different definitions of "species". First off how do you want to define up this supposed limitation. Scientists know that there are no clear barriers. That is why they have different definitions of what a species is and they know that they are not perfect since life evolves.<quoted text>
lets test your knowledge that you can't Google. on average(if there is such) how many mutations or years(your choice) does it take to change from one species to a different species, what is required to call it a different species and what changes need to be seen before they are classified as a new species?
All your question really does is to illustrate that you have no idea what a species is.