18. Which of the following organic compound can carbon able to form?
A. Straight
B. Branched-chain
C. Both A and B
D. None

19. What is an organic compound?
A. compounds that contain the element nitrogen
B. compounds that contain the element hydrogen
C. compounds that contain the element oxygen
D. compounds that contain the element carbon

20. The word organic is derived from what word?
A. Organ
B. Organism
C. Organic
D. Organicist​