chromosome - a strcuture that exists in cells, often as one of a pair, contract (a disease) - to become infected with a disease, enzyme - a natural chemical produced by animal and plant cells, genetic engineering - the practice or science of adding genes to a living thing, genetically modified - a plant or an animal that has had its genetic structure changed, parasite - a plant or an animal that live on another type of plant or an animal and feeds on it, prevalent - very common in a particular place or among the particular group, resistant - not harmed or affected by anything, species - a group of plants or animals that has similar features, transmit (a disease) - to pass a disease from one person to another,

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