An MRI is needed when doctors think there is inflammation, a tumor, or something medically wrong with the brain that we can't see on the outside.
It really depends, think of it as 2 light bulbs in each parent. if both light bulbs in both parents are switched on that means their genes that they inherited are only able to have brown eyed babies, although if just 1 of the 4 light bulbs are not on it allows the baby to have blue eyes.
Answer: Dennis will need to retake his board exams in seven years
Explanation:
Dennis passed his exam but knowing that he will have to take it again in seven years, he continues to study and keep up to date so he can take it again.
Just because Dennis has passed doesn't mean he should stop studying, he should go ahead and be ready for the next test.
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