If biodegradable organic matter, oxygen, and microorganisms are placed in a closed bottle, the microorganisms will use the oxygen in the process of oxidizing the organic matter. the bottle may be treated as a batch reactor and the decay of oxygen may be treated as a firstorderreaction. write the general mass balance equation for the bottle. using a computerspread-sheet program, calculate and plot the concentration of oxygen each day for a periodof 5 days starting with a concentration of 8 mg/l. use a rate constant of 0.35 d-1

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms