Q: What type of experiment involves two identical experiments carried out side-by-side, with and without an independent variable? Choices: - trial run - defined experiment - blind test - controlled experiment A:
controlled experiment

Q: What type of disease occurs when the immune system fails to recognize the body's own molecules? Choices: - gastrointestinal - cardiac - congenital - autoimmune A:
autoimmune

Q: What causes earthquakes at mid-ocean ridges to be small and shallow? Choices: - plates are thin , young , and cold - plates are thick , young , and cold - plates are thick , old , and hot - plates are thin , young , and hot A:
plates are thin , young , and hot

Q: What are the three most common elements in the air we breathe? Choices: - oxygen, nitrogen, H20 - nitrogen, argon, hydrogen - argon, oxygen, hydrogen - nitrogen, oxygen and argon A:
nitrogen, oxygen and argon