The needs of the plot appeared to require that the same species be used. Also a lot of Hindus, Buddhists and vegetarians would be upset if cows or other animals had to die. Plants are multicellular eukaryotic creatures like us except they have cellulose in their cell walls and chloroplasts as well as mitochondria. They are apparently too nutritious and/or too woody to be cute and we have to eat something. Perhaps Franklin wasn't imaginative enough to try hooking up the machine to a cow or a bowl of petunias.Yeah I wonder that as well...One thing that bothered me about that machine was why couldn't they use a cow and have steaks afterwards? Same for Deathwalker's serum, too, what was unique that needed, presumably, the same species for this life transfer to work?
But with Deathwalker's serum the thing is everyone would want it so much, and as she said they'd climb over each other to get it. It would cause a hell of a lot of damage.
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