The most likely effect this will have on the number of cells counted every five days is ;
As the incubation period increases the number of cells will start declining as the stationary phase has already been achieved between 25 to 30 days. also as the nutrient in the medium decreases the cells will try to adapt the the starvation which will lead to the decline in the number of cells.
Hence we can conclude that The most likely effect this will have on the number of cells counted every five days is ; there will be a decline in the number of cells ( chlorella )
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