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Had it done no more than give to Protozoa and Protophyta that cell-form which characterizes them had it done no more than entail the cellular composition which is so remarkable a trait of Metazoa and Metaphyta had it done no more than cause the repetition in all visible animals and plants of that primary differentiation of outer from inner which it first wrought in animals and plants invisible to the naked eye; it would have done much towards giving to organisms of all kinds certain leading traits.
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