Doubling time is the time taken by the organism to increase its population from the initial rate to the final time. Yes, the doubling time is approximately seven days.
On the first day, the population of the water lilies were four and on the seventh day, it was found to be eight. This suggests that the population doubled in a week or in seven days.
On the tenth day, it grew to ten and on the seventeenth day to twenty-two. In the span of seven days, the population of the water Lilly doubled.
Therefore, the doubling time is seven days.
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