Which of the following are the two main sources of oxygen in the air we breathe? a. volcanos and animals
b. animals and phytoplankton
c. green plants and volcanoes
d. phytoplankton and preen nbnt​

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.