When animals use energy, they produce
A B C D
nitrogen iron sulfide oxygen carbon dioxide
Question: When animals use energy, they produce
(A) nitrogen
(B) iron sulfide
(C) oxygen
(D) carbon dioxide

Answer: (D) carbon dioxide
Answer: (C) oxygen
Question: When animals use energy, they produce
(A) nitrogen
(B) iron sulfide
(C) oxygen
(D) carbon dioxide
Answer: (D) carbon dioxide