How long seeds stay viable/healthy?

How can I keep my pancreas healthy. Can a person live without pancrease?

A radioactive isotope has a half life of T years : How long will it take the activity to reduce to 3.125%

can old seeds stil grow ?

Can old seeds still grow?

Mary cycles at the speed of 6 km/h. How long will she take to reach her aunt's house which is 12 km away? How long will she take, if she cycles at the speed of 4km/h?

Give Scientific reasons: Vegetable oils are healthy as compared to vegetable ghee.

Assertion: If a compass needle be kept at magnetic north pole of the earth, the compass needle may stay in any direction. Reason: Dip needle will stay vertical at the north pole of earth.

Answer in one sentence : How long does it take for light to reach the earth from alpha centauri ?