This is kind of hard... Plz help!! These data can be used to estimate the amount of time the cell spends in each
phase of the cell cycle. If there are 100 cells, and 75 of them are in interphase, you
can conclude that the cell spends 75 percent of its time in interphase. If the cell
cycle lasts 24 hours, you would say that the cell spends an average of 18 hours (75
percent of 24 hours) in interphase. Based on the data you have collected, calculate
the average number of cells in each phase of the cell cycle across all five trials and
the average number of cells in each trial. (This second value should be 100.) Using
those numbers, calculate the percent of time spent in each phase of the cell cycle and the number of hours spent in each phase, assuming the overall cell cycle is 10
hours.

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."    

i'd have to say the answer is probable the second option "the geosphere interacting with the atmosphere"