współczynnik urodzeń, birth rate, rosnąć stopniowo, grow steadily, głód, hunger, być zagrożonym, be at risk of, wzrosnąć dramatycznie, increase dramatically, lekarstwo, cure, badania, research, choroba, disease, geny, genes, komórki, cells, źródło, source, zasoby, resources, energia słoneczna, solar power, paliwo, fuel, tlen, oxygen, wodór, hydrogen

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