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The principal result of farm mechanization was the removal from thefarm of much of human and animal labor and replacing that laborwith machines.
When farmers start growing genetically modified crops, they stop growing the old varieties. These old varieties are important sources of diverse genes that give plants other desirable characteristics. For example, a new pest or disease could come along and destroy the genetically modified rice. You are a tomato farmer whose crops are threatened by a persistent species of beetle. 2  Each year, you spend large sums of money for pesticides to protect your crops. 3  A biotechnology company introduces a new strain of tomato plant that produces a natural pesticide, making it resistant to the beetle.