Can someone explain to me why the answer is d? ? i don’t

What is the difference between a scientific hypotheses and a scientific theory?

What mistake did john needham make that caused him to conclude that spontaneous generation for microorganisms occurred? a. he re-contaminated his boiled broth solutions. b. he destroyed the vital force in the solutions. c. he did not boil his broth solutions, only warmed them. d. he failed to seal his flasks of boiled broth. e. he allowed his assistant to conduct the experiment which he did not monitor closely.

What do all celular activities in living organisms use as a source of energy?