It is important to know if a person is predisposed to getting Alzheimer's as he can the precautions for the disease. So a person might want to know if he is predisposed to Alzheimer's. 
<h3>What is Alzheimer's?</h3>
Alzheimer's is a disease that eventually causes the shrinking of brain cells and death of brain cells. This reduces the thinking of a person, and his behavior and social skills are also get declined.
Therefore, knowing a person's risk of building up Alzheimer's is crucial so that they can take the necessary preventative measures. So a person can wonder if he has a higher risk of developing Alzheimer's.
To learn more about Alzheimer's, refer to the link:
brainly.com/question/13567066
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C.) A twist or tear in a muscle. Strain = tearing or stretching of a muscle, Sprain = stretching/tearing of a ligament. 
        
             
        
        
        
Answer:
b they have to have support because they cannot make changes alone