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What are the different ways in which individuals with a particular trait may increase in a population?
 
a. If a population suffers an accident where most members are killed, the survivors will pass on their traits to future generations is called -
b. The separation of a species' population by their respective group due to physical barriers is called -
c. Minor changes in the offspring's genetic information that occur during fertilisation are called -
Answer variants:
Mutation
Genetic drift
Geographic isolation