* Read the following passage and...

Câu hỏi: * Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 24 to 30.

A. They require more energy than autotrophs. 

B. They are not reliant on simple sugars for energy. 

C. They cannot exist without the presence of autotrophs. 

D. They are mostly land-bound organisms.