In which of these investigations would pictures from a camera be most useful?
A B C D
studying bird calls studying exothermic reactions studying the growth of plants studying the diffusion of molecules
Question: In which of these investigations would pictures from a camera be most useful?
(A) studying bird calls
(B) studying exothermic reactions
(C) studying the growth of plants
(D) studying the diffusion of molecules

Answer: (C) studying the growth of plants
Answer: (B) studying exothermic reactions
Question: In which of these investigations would pictures from a camera be most useful?
(A) studying bird calls
(B) studying exothermic reactions
(C) studying the growth of plants
(D) studying the diffusion of molecules
Answer: (C) studying the growth of plants