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Is P. bursaria's ability to detect and move toward light an innate ability, or is it due to the presence of zoochlorellae? Arrange the following steps in the proper sequence needed to answer this question.
1) Introduce P. bursaria from both the experimental and control populations to an aquarium that lacks free-living Chlorella, but that contains bacterial prey.
2) Remove equal amounts of water from the well-lit side of the aquarium and the poorly lit side of the aquarium, census the number and kind of P. bursaria present in each sample.
3) Shine light on only one side of the aquarium containing aposymbiotic P. bursaria.
4) Expose one population of P. bursaria (the experimental population) to an herbicide to kill its zoochlorellae.
5) Collect healthy P. bursaria from the well-lit side of an aquarium and divide it into two equal populations: a control population and an experimental population.
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