Growth and Nutrition of Bacteria
The ability of Vibrio fischeri to produce bioluminescence chemicals only when a certain population density has been reached is an example of

Liebig's law of the minimum
Heisenberg's principle of uncertainty
Shelford's law of tolerance
quorum sensing

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Growth and Nutrition of Bacteria
Generation time is

time required for the population to double
obtained by expression t/n, where t = time interval, n = number of generation
time required for the initial adjustment
both (a) and (c)

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