All of the following are functions of the immune system except: protecting against foreign materials or cells
detecting threats
distinguishing between a threat and healthy tissue
removal of waste

Cells of an organism tell each other when predators are near.

They formed the oceans.  as they melted water was formed and the water made the oceans

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.