Interbreeding two different species of lovebirds produces offspring which are unable to build a nest after they mature (because they lack the innate knowledge needed to carry the nesting materials). The hybrid offspring do not reproduce and this limits genetic mixing of the two species. This is an example of

Many archeologists and anthropologists disagree with dr. thorne's view.  thorne strongly believes that what many calls "homo erectus"  was in fact  homo sapiens,  and that they migrated out of africa almost 2 million years ago and dispersed throughout europe and asia. that's way different  from what scientists have always believed about the evolution of the species.

25 ) where the jellyfish were counted at