Oxygen, the element, is recycled in a biogeochemical cycle within its three main reservoirs: the atmosphere, the total content of biological matter within the biosphere, and the earth's crust. the driving force of the oxygen cycle is photosynthesis, which is responsible for modern earth's atmosphere and life on earth. using the data collected, hypothesize as to which reservoir contributes least to the recycling of oxygen from year to year.

Group control group #1 experimental group yes yes yes control group #2 no new drug orange juice bed rest no yes no yes ves which of the following is the best explanation of why a second control group was included in this experiment? o a. to provide the volunteers in the study with something to drink o b. to prove that the common cold cannot be cured c. to confuse anyone who is trying to steal their new drug and sell it as their own invention o d. to researchers conclude that results are related to the new drug and not to the orange juice submit e previous

Which type of respiration takes place when there is no oxygen present? a. anaerobic b. mitochondrial c. cellular d. aerobica. anaerobic

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?