basic 6th grade test Quiz

Question Number 1 the most accurated theory is the__________________ A. big bang theory B. goldilocks theory C. stellar condensation D. none of this E. either a or b F. nebulai theory Question Number 2 what is the layer of hte atmosphere that is closest to earth? A. troposphere B. ionosphere C. stratosphere D. exosphere E. thermosphere F. there are no atmosphere Question Number 3 a person may avoid getting sick with ailments caused by harmful microorganism by getting___________. A. antigens B. anti-serum C. vaccinated D. blood tranfusion Question Number 4 how are arteries similar to veins? A. they differ in thickness of walls B. they differ in the kind of blood they carry. C. they differ in strength D. they carry blood throughout the body