>>6711429100% not true, many species can interbreed and create fertile offspring, such as polar bears and grizzly bears, among many more.
Species is really a social construct, but it’s useful. The way we used to classify species is just by looking at them and if you can tell 2 individuals as parts of separate groups 75% of the time, that was enough to define a species.
Nature doesn’t play by our “rules”