Because all of biology is connected, one can often make a breakthrough with an organism that exaggerates a particular phenomenon, and later explore the generality.
“Exeter City's trip to Old Trafford will be a great day for their fans but that is about it - they won't get the result they want against Manchester United.”
“One has got to choose between the two evils, also between the lesser of the two evils in the matter of food, and therefore vegetarian food has got to he taken by man in order to sustain human life.”