Reinforcers that satisfy a biological need are called reinforcers.

I think the correct answer would be primary reinforcer. These are biological reinforcers. Examples are drinks, pleasure and food. They are naturally reinforcing objects and are necessary for humans. Hope this answers the question.

The titanic is the answer

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.