Brain › Science & NatureWhich of these bones is hardest to break?CraniumFemurHumerusTibiaAnswerThe correct answer is B) Femur.More Science & Nature questionsWhat does LASER stand for?The asteroid belt is located between which two planets?What is the chemical makeup of water?What is the powerhouse of the cell?What did Gregory Mendel use to test genetic crossovers?What is the first element on the periodic table?Play Brain · Practice