Like they said it's helped a lot with contacting people faster and if anything bad was to happen to anybody you can get someone to come help because you technology and phones to help with that too but it's helped in a lot of ways . Hope this helps ! :)
Answer:
the stairs you can stretch ur back in many ways
<span>Patients suffering from thalassemia require frequent blood transfusions to make up for their short-lived red blood cells. What is the typical lifespan of healthy red blood cells?
<span>The life span of a red blood cell is only about four months.</span></span>
If i am not mistaken it is just A.