The authors point out that it is not known whether the flatworm produces the neurotoxin or has a symbiotic relationship with a microorganism that produces it. Either way, suppose that flatworms could be engineered so they were not associated with any neurotoxin production.

a. Design an experiment you could run to test the hypothesis that flatworms use the neurotoxin for prey capture. Explain how it would provide a test of the hypothesis. 

b. Design an experiment you could run to test the hypothesis that flatworms do not use the neurotoxin for defense against predation. Explain how it would provide a test of the hypothesis.