An individual with thalassemia minor may receive blood transfusions periodically throughout his or her life span. why is it necessary for this person to know what his or her blood type is?

If the person receives blood with the wrong antigen, then the body will attach and reject it. (Second option)

Explanation:

No matter the condition of the patient, whether they have a disease or not, when receiving blood, cross-match is always done to ensure that you are getting the right blood that is compatible with your blood. We check for blood type and Rh factor. If you get blood that does not lack the same antigen as your blood type, your immune system will react to the foreign antigen and destroy it, which in turn rejects it. These types of complications can be detected right away, but it can also be very deadly.

i think it would be reparing roads  

depends on the age of the teen, many believe by the age of 16 a person should know the strong difference between right and wrong along with the difference between risky and immediate death. swimming with sharks might be dangerous but swimming with sharks while bloody meat is attached to you is just insane. even more if you have no idea what you're doing. however, no matter the age, as long as the person is skilled enough and has the mental and physical capacity to control their actions doing whatever sport they put their mind to is all that matters.