During inhalation; a) the volume of the thoracic cavity decreases.
b) the diaphragm relaxes.
c) the diaphragm and rib muscles contract.
d) air moves up the trachea.
e) oxygen molecules move into the lungs, and carbon dioxide molecules move out of the lungs.

When you are making a guess you are forming a hypothesis

Idk i think the answer choice is number 1

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.