Which molecule is indicated by X

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity

Which of the following is a testable hypotheses?

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.