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An understanding of the conditions that allowed life to emerge and exist on our planet is essential if we are to answer two fundamental questions facing humanity - the continuation of life on earth, and the existence of life outside our planet. This text contributes to our understanding of astrobiology as it applies to planet Earth.

Life --- Exobiology. --- Astrobiology --- Biology --- Habitable planets --- Abiogenesis --- Biogenesis --- Germ theory --- Heterogenesis --- Life, Origin of --- Life (Biology) --- Origin of life --- Plasmogeny --- Plasmogony --- Evolution (Biology) --- Exobiology --- Spontaneous generation --- Origin. --- Origin

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Gezondheidsvoorlichting --- Onderwijs --- Seksuele opvoeding --- Gezondheidsvoorlichting. --- Onderwijs. --- Seksuele opvoeding. --- Didactics of secundary education --- Didactics of medicine --- Didactics of social education --- Sexology --- seksuele vorming --- Didactics of primary education

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Weeds --- identification. --- identification --- taxonomy --- noxious plants --- Cuba

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