Which of the following statements is incorrect?
A. Early man knew what fire was.
B. Oxygen comes from the air.
C. We use fire to generate electricity.
D. Fire is very useful if it is kept under control.
Answer:C
Which of the following statements is incorrect?
A. Early man knew what fire was. B. Oxygen comes from the air. C. We use fire to generate electricity. D. Fire is very useful if it is kept under control.