Which of the following statements is true? 1.ground tissue transports water and nutrients around a plant. 2.sweating and shivering are examples of positive feedback. 3. the excretory system filters and removes dissolved waste from the blood. 4.hormones released by the immune system attack foreign bodies and keep an organism healthy. 5.the reproductive system is vital to an individual's life.

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.