Aplants rate of oxygen decreases , which change does this indicate ?
- the plants photosynthesis rate fell
- the plants energy demand rose
- the plants photosynthesis rate rose
- the plants energy demand fell

Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.

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 is any method of measuring the age of an object or event in years, such as using atomic half-life?