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.
how you earn credits in your job. 3. How long you must work to qualify for Social Security The number of credits you need to be eligible for benefits depends on your age and the type of benefit. Retirement benefits Anyone born in 1929 or later needs 10 years of work (40 credits) to be eligible for retirement benefits.ow you earn credits in your job. 3. How long you must work to qualify for Social Security The number of credits you need to be eligible for benefits depends on your age and the type of benefit. Retirement benefits Anyone born in 1929 or later needs 10 years of work (40 credits) to be eligible for retirement benefits.