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Answer:
Zero population growth refers to a population that is unchanging – it is neither growing, nor declining; the growth rate is zero. This demographic balance could occur when the birth rate and death rate are equal
Explanation:
Diffusion helps maintain homeostasis so the cell doesn't have doesn't have a build up of waste chemicals. diffusion transports some of the waste to the outside of the cell so the amount of waste doesn't become to high and dangerous.
Compound microscope would be the one to use