9. Cell division is necessary for an organism to O A. obtain nutrients.
O B. grow and reproduce.
O C. make proteins.
O D. conserve matter and energy

B. Grow and Reproduce

Explanation:

Cell division is the process of parent cell dividing into two or more daughter cells. Cell division occurs as a part of a larger cell cycle, and it is related only to growth and reproduction out of the other choices.

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when it is at an intermediate population density

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.