Micro Organisms
The idea of selective toxicity was first proposed by

Paul Ehrlich
Antony van Leeuwenhoek
Alexander Fleming
Louis Pasteur

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Micro Organisms
Genetic and biochemical similarities between contemporary cyanobacteria and eukaryotic chloroplasts are accepted to mean that

eukaryotes evolved from archaea
cyanobacteria arose from chloroplasts which escaped from plant cells
oxygenic photosynthesis first evolved in eukaryotes
eukaryotes evolved from bacteria

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