A. is formed naturally
B. is cheap
C. can be recycled after use
D. cannot be regenerated once used up
Correct Answer: Option D
D. cannot be regenerated once used up
A. is formed naturally
B. is cheap
C. can be recycled after use
D. cannot be regenerated once used up
Correct Answer: Option D
D. cannot be regenerated once used up
Copyright warnings! Do not copy.