A mutation is a change that occurs in our DNA sequence, either due to mistakes when the DNA is copied or as the result of environmental factors such as UV light and cigarette smoke.
If you were born in 1929 or later, you need to work at least 10 years to become eligible for Social Security. The SSA determines eligibility with a system of credits. Basically, you earn up to four credits for every year worked, and you need a total of 40 credits to qualify for Social Security.
To qualify for social Security retirement benefits you must meet certain requirements and one of the requirements is that if you were born after 1929 you will need to have accumulated 40 credits ( 10 years working . ) If you happen to stop working before this number of credits has been accumulated then you will not be eligible Social security ...