Classical conditioning can explain the placebo effects of a fake pill because the pill can serve as a stimulus for the actual drug.

If the experiment was perfomed more then once and you get the same results

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.

Since we don't see a strand; i got answers off a sheet and the correct answer is "2".

Yes yes yes very good