What evidence from graph one suggests that there was still some live bacteria in the milk on day 5?

Graph one likely shows a decline in bacterial count over the days, but if there is still a non-zero value on day 5, it suggests that some live bacteria remained in the milk. Additionally, if the graph indicates a plateau or slow decrease in bacterial numbers rather than a complete elimination, this further implies the presence of viable bacteria. This evidence indicates that while the overall bacterial load was reduced, it did not reach zero by day 5.