INFECTIOUS, An illness passed from one person to another, PESTICIDE, A substance for killing insects that destroy crops, IMPLICATIONS, Possible future effect, FAMINE, Not enough food for a large number of people, FERTILITY, The ability to produce babies, INHUMANE, Cruel, DEGRADATION, The process by which something gets worse, CONFRONT, To face a person or problem, CONTRACEPTION, Ways to prevent a woman getting pregnant, FERTILIZER, A substance that helps plants grow, DEMOGRAPHER, A person who studies changes in numbers of births and deaths

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