Final answer:
Bacteria is the best example of exponential growth, where the population doubles in a set time period. This can be represented by the equation y = 2^x, where y represents the number of bacteria and x represents the time in hours.
Step-by-step explanation:
Bacteria is the best example of exponential growth. Bacteria reproduce through fission, where each organism divides and doubles its population in a set time period. For example, if 1000 bacteria are placed in a flask, after an hour there will be 2000 organisms, after another hour there will be 4000 organisms, and so on. This exponential growth can be represented by the equation y = 2^x, where y represents the number of bacteria and x represents the time in hours.