Answer:
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Delete usual. Custom and usual do not flow together and a custom is already a usual thing, just like tradition.
Answer: The purpose of vaccination is to produce immunity. Immunity means the presence in a person's body of cells and substances known as antibodies that can produce a protective immune response.
It was uncommon that a bright student would have such poor grades.
I think it was c because i just remember they said that the animals aren’t usually fed idk i haven’t been in middle school in a min