Micro Organisms
The idea of selective toxicity was first proposed by

Louis Pasteur
Paul Ehrlich
Antony van Leeuwenhoek
Alexander Fleming

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

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

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