The essay shows that different levels of caffeine killed the flatworms.
The lowest amount allowed them to survive while higher doses (4 out of 5) killed them.
0.00001 M Caffeine allowed them to survive, while .0001 killed them off slowly. .1M killed them the next day. Re-review the essay, you will find it on pg 23.
200 mg is nothing. Most sites show that about 10 grams is the LD50. How many people consume 5 cups of coffee? 5 sodas containing caffeine? 200 is the starting point for so many who just get up in the morning to start their caffeine ritual.