There is no quantifier in the stimulus....how do we make the determination that we should assume the test makers are referring to some in an instance like this?
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In this particular case, we can say for certain that some genetic mutations have occurred at random. How do we know this? Because these random mutations were observed in experiments. How many experiments? It doesn't matter. The fact that this phenomenon was observed at least once is enough for us to say "some."
A single example of something is enough to conclude "some."
If my brother has a cold, we can say that some members of my family are sick.
If my dog is afraid of cats, we can say that some dogs are afraid of cats.
In example question 15, the quantifier is implied when the completed experiments are described.
